xci: Updates to releng/osa to make it work on Jenkins

xci: Updates to releng/osa to make it work on Jenkins

- change OSA_BRANCH to OPENSTACK_BRANCH to be consistent everywhere.
- create opnfv-setup-openstack.yml playbook, getting rid of some components
and copy it to xcimaster to use during the deployment.
- switch to opnfv-setup-openstack.yml from setup-openstack.yml.
- create Jenkins job wrapper to execute osa deploy script.
- disable ansible strict host key checking.
- use sudo -E as needed in order to make env vars set by Jenkins
job and wrapper available to other scripts and to ansible.
- rename jumphost to xcimaster so people do not mix it with actual
jumphost located in Pharos PODs.
- other minor fixes.

Change-Id: I5736fa700c2aa39c598d301bc74450d766b74411
Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>