Elaborated with git commands
Merge pull request #2 from edeedhu/dev-onf-driver

Commit Zero.
Design TBD: 
1. concurrent server model for threads
2. openflow version negotiation in the of-aware layer
3. connection retries with graceful backoff in the of-aware layer
Modified cc_of_global.h
  * a struct was defined twice. fixed it.
  * introduced the tracking of poll threads.

Added new files
  * a .h and .c for poll thread management

TBD
  * additional comments in the poll thread manager .h/.c files
  * additional #includes in poll thread manager .h file for compiling