Fix indent in cincer/volume/configuration.py

Change-Id: I7d6e01de7dbc542ebe8fc35c0776de7a099f91e6
Fixes Opt type of use_multipath_for_image_xfer

Changed use_multipath_for_image_xfer from StrOpt to BoolOpt

Change-Id: Id02ba23b233d348885250ccb8c14fcf04667adec
Delete snapshot metadata when snapshot is deleted

When a volume is deleted all rows in the volume_metadata table for that
volume are deleted as part of the database operation. This patch updates
the snapshot delete operation to delete corresponding rows in the
snapshot_metadata table.

Change-Id: I17543a82be370bed57d4165ad8756ccb390bc0d9
Merge "Fixes Opt type of use_multipath_for_image_xfer"
Merge "Fix indent in cincer/volume/configuration.py"
Merge "Delete snapshot metadata when snapshot is deleted"