Added a dependency for ovsdb features.

This patch added a dependency for odl-ovsdb-all feature to
odl-vtn-manager-neutron.
The odl-ovsdb-all feature contains ovsdb library and plugin which
necessary for VTN Manager Neutron bundle.

Change-Id: I509330e601df560941ce3d1a454af3f0b6ad67d6
Signed-off-by: Hideyuki Tai <Hideyuki.Tai@necam.com>
Merge "Added a dependency for ovsdb features."