Add sleep after Contrail Control installation

Related-Bug: PROD-26298

Related-Commit: https://gerrit.mcp.mirantis.com/#/c/33562/

For virtual labs with low resources need wait for
Contrail services to be ready.

Change-Id: Id848b9628a2486ca6aa4ac2619b4043f01365e2c
(cherry picked from commit fb242db2e7463f328ff89d6224485fee9e19cf21)
1 file changed