This commit introduces the management of a new component opencontrail[1].
Opencontrail is a Sofware Defined Network solution. A new approach has
been taken here to include it. Since not every deployment will need to
manage an opencontrail solution, every related file have been put into
'manifests/network/contrail' (including the HA bits). The HA bits are
then included in loadbalancer.pp and not created (ie. set to false) by
default.
[1] http://www.opencontrail.org/
Change-Id: I135f575560b0dde707a28e995da5b00b7aa6d765
610927499e