Allow _destroy_vdis if a mapping has no VDI
Allow _destroy_vdis if a mapping has no VDI

In _destroy_vdis() in the xenapi vmops.py, a list of VDIs to not
destroy is collected.  If one of the block device mappings does
not have a corresponding VDI, however, _destroy_vdis() fails
(KeyError('vdi_uuid') is raised).  This interferes with
instance deletion.  The problem is corrected by skipping mappings
for which the connection_info data does not contain 'vdi_uuid'.

Fixes bug 1030143.

Change-Id: I5125d557ab799fcf572f665523cd07a893ad3b90

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