Notification object - preparing for pagination

Related to blueprint nailgun-objects-flow

Related to blueprint nailgun-rest-api-pagination

Change-Id: Icec50899f1048a6360740f03f3879c2a25067ea9
LESS refactoring

blueprint ui-refactor-less-styles

Change-Id: I3e96068227957796eae8daaeb15ca1f51e46714d
Merge "Notification object - preparing for pagination"
vCenter integration UI added
removed kvm and qemu hypervisors for custom CentOS release
changed the vcenter UI, added dependencies, removed separate release
vcenter integration UI refactored
added dependency. neutron option will be not available with vcenter