Pull connection handling code out of doTunnelMigrate

Simplify the doTunnelMigrate() method by pulling out the code
which opens/closes the virConnectPtr  object into a parent
method

* qemu/qemu_driver.c: Add doPeer2PeerMigrate which then calls
  doTunnelMigrate with dconn & dom_xml

docs/libvirt-api.xml

@@ -47,6 +47,7 @@
      <exports symbol='VIR_MIGRATE_LIVE' type='enum'/>
      <exports symbol='VIR_DOMAIN_EVENT_STOPPED_DESTROYED' type='enum'/>
      <exports symbol='VIR_DOMAIN_EVENT_DEFINED_ADDED' type='enum'/>
+     <exports symbol='VIR_VCPU_BLOCKED' type='enum'/>
      <exports symbol='VIR_SECRET_USAGE_TYPE_NONE' type='enum'/>
      <exports symbol='VIR_DOMAIN_EVENT_STARTED_MIGRATED' type='enum'/>
      <exports symbol='VIR_STREAM_EVENT_HANGUP' type='enum'/>
@@ -82,7 +83,7 @@
      <exports symbol='VIR_STREAM_EVENT_WRITABLE' type='enum'/>
      <exports symbol='VIR_DOMAIN_SCHED_FIELD_DOUBLE' type='enum'/>
      <exports symbol='VIR_DOMAIN_SCHED_FIELD_LLONG' type='enum'/>
-     <exports symbol='VIR_VCPU_BLOCKED' type='enum'/>
+     <exports symbol='VIR_MIGRATE_TUNNELLED' type='enum'/>
      <exports symbol='VIR_DOMAIN_SCHED_FIELD_BOOLEAN' type='enum'/>
      <exports symbol='VIR_DOMAIN_XML_INACTIVE' type='enum'/>
      <exports symbol='VIR_STORAGE_VOL_BLOCK' type='enum'/>
@@ -718,7 +719,8 @@
     <enum name='VIR_FROM_XML' file='virterror' value='5' type='virErrorDomain' info='Error in the XML code'/>
     <enum name='VIR_MEMORY_PHYSICAL' file='libvirt' value='2' type='virDomainMemoryFlags' info=' addresses are physical addresses'/>
     <enum name='VIR_MEMORY_VIRTUAL' file='libvirt' value='1' type='virDomainMemoryFlags' info='addresses are virtual addresses'/>
-    <enum name='VIR_MIGRATE_LIVE' file='libvirt' value='1' type='virDomainMigrateFlags' info=' live migration'/>
+    <enum name='VIR_MIGRATE_LIVE' file='libvirt' value='1' type='virDomainMigrateFlags' info='live migration'/>
+    <enum name='VIR_MIGRATE_TUNNELLED' file='libvirt' value='2' type='virDomainMigrateFlags' info=' tunnelled migration'/>
     <enum name='VIR_SECRET_USAGE_TYPE_NONE' file='libvirt' value='0' type='virSecretUsageType'/>
     <enum name='VIR_SECRET_USAGE_TYPE_VOLUME' file='libvirt' value='1' type='virSecretUsageType' info=' Expect more owner types later...'/>
     <enum name='VIR_STORAGE_POOL_BUILDING' file='libvirt' value='1' type='virStoragePoolState' info='Initializing pool, not available'/>
@@ -1596,6 +1598,8 @@ host given by dconn (a connection to the destination host).
 
 Flags may be one of more of the following:
   VIR_MIGRATE_LIVE   Attempt a live migration.
+  VIR_MIGRATE_TUNNELLED Attempt to do a migration tunnelled through the
+                        libvirt RPC mechanism
 
 If a hypervisor supports renaming domains during migration,
 then you may set the dname parameter to the new name (otherwise

docs/libvirt-refs.xml

@@ -154,6 +154,7 @@
     <reference name='VIR_MEMORY_PHYSICAL' href='html/libvirt-libvirt.html#VIR_MEMORY_PHYSICAL'/>
     <reference name='VIR_MEMORY_VIRTUAL' href='html/libvirt-libvirt.html#VIR_MEMORY_VIRTUAL'/>
     <reference name='VIR_MIGRATE_LIVE' href='html/libvirt-libvirt.html#VIR_MIGRATE_LIVE'/>
+    <reference name='VIR_MIGRATE_TUNNELLED' href='html/libvirt-libvirt.html#VIR_MIGRATE_TUNNELLED'/>
     <reference name='VIR_NODEINFO_MAXCPUS' href='html/libvirt-libvirt.html#VIR_NODEINFO_MAXCPUS'/>
     <reference name='VIR_SECRET_USAGE_TYPE_NONE' href='html/libvirt-libvirt.html#VIR_SECRET_USAGE_TYPE_NONE'/>
     <reference name='VIR_SECRET_USAGE_TYPE_VOLUME' href='html/libvirt-libvirt.html#VIR_SECRET_USAGE_TYPE_VOLUME'/>
@@ -659,6 +660,7 @@
       <ref name='VIR_MEMORY_PHYSICAL'/>
       <ref name='VIR_MEMORY_VIRTUAL'/>
       <ref name='VIR_MIGRATE_LIVE'/>
+      <ref name='VIR_MIGRATE_TUNNELLED'/>
       <ref name='VIR_NODEINFO_MAXCPUS'/>
       <ref name='VIR_SECRET_USAGE_TYPE_NONE'/>
       <ref name='VIR_SECRET_USAGE_TYPE_VOLUME'/>
@@ -1596,6 +1598,7 @@
       <ref name='VIR_MEMORY_PHYSICAL'/>
       <ref name='VIR_MEMORY_VIRTUAL'/>
       <ref name='VIR_MIGRATE_LIVE'/>
+      <ref name='VIR_MIGRATE_TUNNELLED'/>
       <ref name='VIR_NODEINFO_MAXCPUS'/>
       <ref name='VIR_SECRET_USAGE_TYPE_NONE'/>
       <ref name='VIR_SECRET_USAGE_TYPE_VOLUME'/>
@@ -2654,6 +2657,9 @@
           <ref name='virNetworkGetUUIDString'/>
           <ref name='virSecretGetUUIDString'/>
         </word>
+        <word name='RPC'>
+          <ref name='virDomainMigrate'/>
+        </word>
         <word name='Re-attach'>
           <ref name='virNodeDeviceReAttach'/>
         </word>
@@ -2912,6 +2918,9 @@
         <word name='VIR_MIGRATE_LIVE'>
           <ref name='virDomainMigrate'/>
         </word>
+        <word name='VIR_MIGRATE_TUNNELLED'>
+          <ref name='virDomainMigrate'/>
+        </word>
         <word name='VIR_SECRET_USAGE_TYPE_VOLUME'>
           <ref name='virSecretGetUsageID'/>
         </word>
@@ -5604,6 +5613,9 @@
         <word name='means'>
           <ref name='virDomainPinVcpu'/>
         </word>
+        <word name='mechanism'>
+          <ref name='virDomainMigrate'/>
+        </word>
         <word name='mem'>
           <ref name='_virNodeInfo'/>
         </word>
@@ -7381,6 +7393,9 @@
           <ref name='virStoragePoolRef'/>
           <ref name='virStorageVolRef'/>
         </word>
+        <word name='through'>
+          <ref name='virDomainMigrate'/>
+        </word>
         <word name='time'>
           <ref name='_virDomainInfo'/>
           <ref name='_virVcpuInfo'/>
@@ -7443,6 +7458,9 @@
         <word name='trying'>
           <ref name='virConnectOpen'/>
         </word>
+        <word name='tunnelled'>
+          <ref name='virDomainMigrate'/>
+        </word>
         <word name='turn'>
           <ref name='virConnectOpen'/>
         </word>