xci: installer: Do not use XCI_ANSIBLE_PARAMS on remote nodes

xci: installer: Do not use XCI_ANSIBLE_PARAMS on remote nodes

The XCI_ANSIBLE_PARAMS is used to pass extra Ansible parameters to XCI.
However, these parameters may not make sense when Ansible is running on
any of the remote nodes, so we should't use it there. If passing
information to "remote" Ansible is required, then we need to come up
with a new variable.

deploy-scenario:os-nosdn-nofeature
installer-type:osa

Change-Id: Ib6343fbfe3af1514c2e7e8948c12e3b19b455fe3
Signed-off-by: Markos Chandras <mchandras@suse.de>