CLOUDSTACK-3343 UI/API should also return the mode(Strict/Preferred) when listing the ServiceOffering that uses ImplicitDedicationPlanner

Changes:
- API is fixed to return the service_offering details

Conflicts:

	api/src/org/apache/cloudstack/api/response/ServiceOfferingResponse.java
CLOUDSTACK-3871 XEN - Unable to deploy VM in guest network VLAN with different subnets

Signed-off-by: Sheng Yang <sheng.yang@citrix.com>