Resource metadata - support for VPC

Conflicts:
	api/src/com/cloud/server/ResourceTag.java
	server/src/com/cloud/metadata/ResourceMetaDataManagerImpl.java
List view: Support passing custom ID to detail view context

For section select list views, if 'id' is specied under section: {},
then use that ID instead of the section's key ID. This allows sections
to use i.e. the same ID as each other for a consistent context ID.
System, main routers page: Split into subsections (WIP)