1. Transitioned to using latest asn1c compiler

2. Added prefix extension to E2AP, X2AP and E2SM get/set methods and moved to common directory
3. Added response codes to subscription handler.
4. Allow various levels of processing in message processor engine and compute metrics
5. Added unit test cases, test data and mock-ups for integration tests.
6. Updated docker file image
7. Added README files
8. Added schema for configuration file

Signed-off-by: Ashwin Sridharan <asridharan@research.att.com>
Change-Id: If7264be5fab65a5b18e7aa283dabe9b78a990111
Signed-off-by: Ashwin Sridharan <asridharan@research.att.com>