l2pop: Allow network types overridable

Currently "tunnel_types" is used for two different purposes; l2pop and
check_segment_for_agent.  This commit introduces a new agent
configuration "l2pop_network_types" to allow overriding the former.

This will be used by ofagent, which wants l2pop info for TYPE_VLAN
as well.

Related: blueprint ofagent-l2pop
Related: blueprint ofagent-merge-bridges
Change-Id: Ia83a94b6661aa36afa8bfeb073101171ffde62a9
Remove reference to cisco_cfg_agent.ini from setup.cfg again

No sample .ini file is included, causing install to fail.
Remove the reference again.

Change-Id: I97ffe464e4eb9689ee290c3c95ac19d4e09029e2
Closes-bug: #1351466
Merge "l2pop: Allow network types overridable"
Merge "Remove reference to cisco_cfg_agent.ini from setup.cfg again"