main: Added fib manager to management initialization

Change-Id: Ib0553998aee8e47f79180acdb20f75e15f765aac
refs: #1139
table: added findExactMatch and remove methods to Fib

Added methods required to implement remaining FIB
management commands.

refs: #1223

Change-Id: Idf27a60a19286ab1d5712bbc00cca7f41092807b
core: Fixing scheduler, so it doesn't crash when an event is cancelled from the event invocation

Change-Id: I219df36a4ed19d75e97e676bedeba023fd53326e
mgmt: added FIB manager support for insert, delete, and remove-nexthop verbs

Refactor option decoding, verb authorization (placeholder),
and response sending into single location.
Added unit tests for ManagerBase.

refs: #1223

Change-Id: I731be586ee8f06defb00fcadc6010409560891a1
ci: Fixes for travis-ci

Change-Id: I717d7efab8fc1812eec5791ea649c20d96af3087