Added force-delete api support

Added apis:
'force-delete' (share)
'snapshot-force-delete' (snapshot)

Difference from 'delete' API is in avoiding
check of share/snapshot status.

Partially implements: blueprint manila-client-enhancements

Change-Id: I97122c6566a246448ccabf401ad90b51c1d0d4a8
Merge "Added force-delete api support"