Automation Tests for HA Proxy Stickiness

Reviewed-by: Suresh Sadhu <Suresh.Sadhu@citrix.com>
Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit 56ccb2835b28c04bbecc3910b20cc5c0b016bda5)
added support for ispersistent parameter for networkoffering

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit 7b5daaea2011932a5a6a6ee5b6c93b593c53e522)
CLOUDSTACK-4647: Fixed snapshot_gc test case and common util function is_snapshot_on_nfs

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit 0bbe5684981cf21d30455de4f12dd1c2e58d94ea)
CLOUDSTACK-4780: Fixed BVT test case TestSnapshotRootDisk.test_01_snapshot_root_disk

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit b12ff1d6ce964e30d0b919c29ab92af450e4dcf9)
CLOUDSTACK-4256 - Fixed shared network test cases

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit 8350a6bd4c982ca0b2f6e45f5f60d923135e49d2)