Changes

Feature 7106 : Handle additional EPA parameters for openstack VIM
connector
Gerrit feature request : https://osm.etsi.org/gerrit/#/c/7106/
Changes:
NFVO engine to read and parse the quota descriptor and store as flavor
extended properties.
Openstack VIM Connector to process the new extended properties and
suitably pass them as extra specs when creating flavor.
Change-Id: Icdd8730f6f6de6d420027de962f0f5def0376375 Signed-off-by:
anwars <anwars@vmware.com>