[ACS44] cherry-pick commits for CLOUDSTACK-6592, CLOUDSTACK-6593, CLOUDSTACK-6608, CLOUDSTACK-6609

[Murali Reddy]

Please cherry-pick below commits in 4.4-forward for the bugs
CLOUDSTACK-6592, CLOUDSTACK-6593, CLOUDSTACK-6608, CLOUDSTACK-6609      

2301ceb143b24731f5b211b797a7cc4d5a7912fe
52257bc418476c361a831b9a0ada68a8b746bce9
df65b2e7c438986fac645f0a33688f8b36a12152
eaf04d44a72351d250725c9194bd0cafae0ea1e6