Modify quantum plugin to work with Albacore VSM post sync. (Use VSM build 370+)
Changes made are related to VSM REST api. Paths and tags.
Fix network delete bug. (sync from havana branch)
Fix deletes. Delete from local quantum DB if an exception is raised from VSM.

Change-Id: I13ff4b835138ad3067dac5006a396c5c5fde5154