CLOUDSTACK-5032 Provides custom assert facility to test features

Added assertElementInList to cloudstackTestCase.
Users can use this new custom addition to add
assertions, thus replacing current multiple assertions

Signed-off-by: Santhosh Edukulla <Santhosh.Edukulla@citrix.com>
CLOUDSTACK-3715. Socket timeout error is observed in VMware setup if a VMware task (RelocateVM_Task, CloneVM_Task etc.) takes more than 10 minutes. Making this value configurable to allow admins to modify the timeout if required. It defaults to the current value i.e. 10 minutes.