OVSDB QoS - move QoS and Queue lists to OVSDB Node

The QoS and Queue tables are root tables in OVSDB.  Updates to
these tables can occur independently from the port table - so
this patch proposes to move lists of QoS and Queue entries to
the ovsdb-node-attributes (i.e. OVSDB Node) object in the MD-SAL.

v2 - removed the 'do not merge' notice from subject line

Change-Id: I77654f144ec6876f0a807b6b723d723e691215f1
Signed-off-by: Eric Multanen <eric.w.multanen@intel.com>