Fixes: Start Redis server before contrail webui

Contrail WebUI needs redis server to be up and running so that it can
start. This fix tries to retry starting the contrail webui a few times
(10) before it bails out. The contrail webui starts after 5-6 attempts
during our testing, so we have set the value to 10 here.

Change-Id: I14377c152b802514eda6df74bd9e932c8fafdf90
Closes-Bug:1386816