Creating separate proactive flows for internal and external ports.
1. this helps writting less address observation to store.
2. due to point 1. no conclicting commits are observed for test upto
64 switches 10 hosts each.
3. this affects mac to mac flow writer as flows are not written on
each switch. Improved solution is required for this.

Change-Id: I70024f2a300b74f65b8e16e231114a9bd1b17ba7
Signed-off-by: Amit Mandke <ammandke@cisco.com>