CloudStack CLOUDSTACK-3307
UCS:DB: Same UCS manager can be added multiple times
CLOUDSTACK-2729: use file lock to prevent concurrent refreshPool/deleteVolume on KVM shared storage pool

Signed-off-by: Edison Su <sudison@gmail.com>
fix warnings in NetworkServiceImpl: removed unused code and add cases to switches

Signed-off-by: Sheng Yang <sheng.yang@citrix.com>
CLOUDSTACK-2340: Display service state for health-checked VMs