jjb: xci: bifrost: Clone git repositories to $WORKSPACE

jjb: xci: bifrost: Clone git repositories to $WORKSPACE

Commit 0638af211db1 ("jjb: xci: xci-deploy.sh: Run the deployment
script as normal user") dropped 'sudo' from the bifrost provisioning
script. However this broke the jobs since the repositories were being
cloned into /opt where the jenkins user has not access to. As such,
clone the repositories in the $WORKSPACE directory instead.

Fixes: 0638af211db1 ("jjb: xci: xci-deploy.sh: Run the deployment script as normal user")
Change-Id: I55baceaada04496884470997562e3f512f2444a0
Signed-off-by: Markos Chandras <mchandras@suse.de>