Fixes to SFC Agent, SFF and SF implementations

- SF would not accept packets when SFF on the same host
- SF/SFF now bind to 0.0.0.0 instead of specific IP
- Moved some globals to another module sff_globals.py
- Fixed CLI input for SF/SFF/SFF_CLIENT
- Created shell scripts to start SFC agent and SF
- other Misc fixes

Change-Id: Ia7635659022aeaf0bbb4d937c3f465fa2c6ed02a
Signed-off-by: Reinaldo Penno <rapenno@gmail.com>