Merge 'origin/topic/schema' branch into merge-branch

Merge 'origin/topic/schema' branch into merge-branch

Change-set includes :

1. Schema Independent Library layer/bundle with no dependencies to other Opendaylight components
2. Library can be also be used in a non-osgi environment
3. Redesigned Plugin, Neutron and NorthboundV2 layers that make use of the Schema independent library
4. Static Typed Schemas - Open_vSwitch and hardware_vtep as a thin wrapper layer on top of library
5. Unit & Integration Tests with PAX-Exam integration for most of the newly added/modified code-base
6. Bundle names and versions are modified to reflect the new functionalities

Change-Id: I126de455692bc38f287ac2874da796f00f39ba7a
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>