removed redundant log file in the bgp folder
Completed route-server implementation using exabgp with hooks for SDX controller.

Added features:
(1) Support for route server logic with a trivial bgp decision process at the moment
(2) Independent Input and Local RIB for each participant
(3) Support for adding custom routes in the Input or Local (i.e., after BGP decision) RIB from SDX
(4) Annoucing custom routes from SDX
(5) Filtering support for SDX, based on BGP attributes, for both Input and Local RIB.
Completed the client/server interface between exabgp and route-server/sdx.