Bug:2103 Insure that we start the InventoryManager and friends first

If the InventoryManager and friends are not started before
the openflowplugin begins accepting connections, they may not
be informed and thus not record whole nodes.

Change-Id: I24be7991d3ee9022ca95b2e85bb8eb445cdf7dc9
Signed-off-by: Ed Warnicke <eaw@cisco.com>