jenkins: Add wrapper scripts to run Docker containers

 * run-server.sh creates a container in detached mode, as used by Jenkins.
   For convenience it prints the new container's ID and the ssh command to
   log into it.

 * run-interactive.sh creates a container in interactive mode, running bash.
   The container will be destroyed when the shell exits.

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #578 from euanh/jenkins

jenkins: Add wrapper scripts to run Docker containers