Block info query: Add check for transient domain

Currently the qemuDomainGetBlockInfo will return allocation == physical
for most backing stores. For a qcow2 block backed device it's possible
to return the highest lv extent allocated from qemu for an active guest.
That is a value where allocation != physical and one would hope be less.
However, if the guest is not running, then the code falls back to returning
allocation == physical. This turns out to be problematic for rhev which
monitors the size of the backing store. During a migration, before the
VM has been started on the target and while it is deemed inactive on the
source, there's a small window of time where the allocation is returned
as physical triggering the code to extend the file unnecessarily.

Since rhev uses transient domains and this is edge condition for a transient
domain, rather than returning good status and allocation == physical when
this "window of opportunity" exists, this patch will check for a transient
(or non persistent) domain and return a failure to the caller rather than
returning the defaults. For a persistent domain, the defaults will be
returned. The description for the virDomainGetBlockInfo has been updated
to describe the phenomena.

include/libvirt/libvirt.h.in

@@ -2140,7 +2140,8 @@ int                     virDomainBlockResize (virDomainPtr dom,
 
 /** virDomainBlockInfo:
  *
- * This struct provides information about the size of a block device backing store
+ * This struct provides information about the size of a block device
+ * backing store
  *
  * Examples:
  *
@@ -2153,11 +2154,12 @@ int                     virDomainBlockResize (virDomainPtr dom,
  *
  *  - qcow2 file in filesystem
  *       * capacity: logical size from qcow2 header
- *       * allocation, physical: logical size of the file / highest qcow extent (identical)
+ *       * allocation, physical: logical size of the file /
+ *                               highest qcow extent (identical)
  *
  *  - qcow2 file in a block device
  *       * capacity: logical size from qcow2 header
- *       * allocation: highest qcow extent written
+ *       * allocation: highest qcow extent written for an active domain
  *       * physical: size of the block device container
  */
 typedef struct _virDomainBlockInfo virDomainBlockInfo;