CLOUDSTACK-5923: CS doesn't do master switch for XS any more, CS will depend on XS HA to do master switch, XS HA needs to be enabled.

(cherry picked from commit b79f949e1bd9d62b3ebcce424608cb4b22e69897)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Conflicts:
	plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/discoverer/XcpServerDiscoverer.java
	plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
	plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServerConnectionPool.java
CHANGES: update list of issues fixed for 4.3.2

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>