[Xen-API] [BUG?] vhd-parent missing after snapshot removal

[George Shuklin <george.shuklin@xxxxxxxxx>]

Good day.

Found strange behavior (bug?) in xapi: it removes vhd-parent from 
sm-config of VDI after removing most recent snapshot.
How to reproduce:

VDI=`xe vdi-create ....`
SN1=`xe vdi-snapshot uuid=$VDI`
(perform some write operations on VDI to  force creation of second base 
copy)
SN2=`xe vdi-snapshot uuid=$VDI`
xe vdi-destroy uuid=$SN2
xe vdi-list uuid=$VDI params=sm-config

Expected:
sm-config vhd-parent: uuid_of_corresponding_base_copy

Got:
sm-config contains no vhd-parent.

Why this important? vhd-parent links alllows to calculate sizes of all 
VHD's, related to snapshot/clone tree. Without vhd-parent we need to 
rely on snapshort-of and snapshots fields, which are not really reliable 
(vdi-clone break the chain).
This bug does not affects snapshot functionality, AFAIK real VDI chain 
is reconstructed from internal headers of VDI, but affects software 
using XenAPI.
Thanks.

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