NetApp check for 7 mode controller version

Queries the filer api version and raises error
if the version is unsupported.

Closes-Bug:#1223474

Change-Id: I430a41d63a2541891fdbdb20dacab9f69fa44291
Soft delete tmp migration volume

Previously the row for the temporary migration volume was deleted from
the database, which caused a foreign key violation for its admin
metadata. Regardless, the volume should have been soft deleted from the
database anyway, and this patch takes care of that.

Change-Id: I8e4942b0e21ec79c90aa95b18b5612b5b133fd62
Closes-Bug: #1219097
Merge "Soft delete tmp migration volume"
Merge "NetApp check for 7 mode controller version"