Connect ODL CI-CD to XCI

Provide the possibility to select what version of ODL to use, master included.
Before executing xci-deploy.sh, the user can specify ODL's version by using the
XCI_ANSIBLE_PARAMS variable:

export XCI_ANSIBLE_PARAMS="-e ODL_VERSION=oxygen"

Change-Id: I5b3879b0c197059b3aecace48760e983c65a586b
Signed-off-by: Manuel Buil <mbuil@suse.com>