Add new API virDomainBlockPull* to headers

Set up the types for the block pull functions and insert them into the
virDriver structure definition.  Symbols are exported in this patch to
prevent
documentation compile failures.

* include/libvirt/libvirt.h.in: new API
* src/driver.h: add the new entry to the driver structure
* python/generator.py: fix compiler errors, the actual python bindings
* are
  implemented later
* src/libvirt_public.syms: export symbols
* docs/apibuild.py: Extend 'unsigned long' parameter exception to this
* API

docs/apibuild.py

@@ -1641,7 +1641,9 @@ class CParser:
         "virDomainMigrateSetMaxSpeed"    : (False, ("bandwidth")),
         "virDomainSetMaxMemory"          : (False, ("memory")),
         "virDomainSetMemory"             : (False, ("memory")),
-        "virDomainSetMemoryFlags"        : (False, ("memory")) }
+        "virDomainSetMemoryFlags"        : (False, ("memory")),
+        "virDomainBlockJobSetSpeed"      : (False, ("bandwidth")),
+        "virDomainBlockPull"             : (False, ("bandwidth")) }
 
     def checkLongLegacyFunction(self, name, return_type, signature):
         if "long" in return_type and "long long" not in return_type:
@@ -1667,7 +1669,8 @@ class CParser:
     # [unsigned] long long
     long_legacy_struct_fields = \
       { "_virDomainInfo"                 : ("maxMem", "memory"),
-        "_virNodeInfo"                   : ("memory") }
+        "_virNodeInfo"                   : ("memory"),
+        "_virDomainBlockJobInfo"         : ("bandwidth") }
 
     def checkLongLegacyStruct(self, name, fields):
         for field in fields: