Fix varnish

Its a few changes to make varnish more easy to manage and deploy.

- Varnishtools is on the PATH
- Fix deploy error when a vcl syntax is wrong
- Enable Varnish Management interface (varnishadm -T $OPENSHIFT_VARNISH_ADMIN_IP:$OPENSHIFT_VARNISH_ADMIN_PORT)

- Varnishlog and other tools can access "vsm" file via $VARNISH_VSM_FILE
- Included libvmod_std.so library
- Few changes on start command to load vmods and vcl's.