beta: send purges to deployment-cache-text1

deployment-cache-text1 [10.4.1.133] is a varnish cache for text, it is
going to phase out the old deployment-squid instance.  So add it to the
list of cache to be purged.

Change-Id: I0e2b096294e8a364c70ddf85423bcebfa8b6c05b