Update HP 3PAR supported operations

Manage/unmanage support was added in the Juno release with patch:
https://review.openstack.org/#/c/113729/

This patch is adding the manage and unmanage a volume to the list
of supported operations for the HP 3PAR drivers.

Change-Id: I00aba2b753fa9655031ee49f7ad823b9e6e573a4
Merge "Update HP 3PAR supported operations"