Sanitize $HOST markers before propagating to confmon

This way the configuration cache can take advantage of CCCP configs.

Change-Id: I57e2b3ad0e6be1cb1e39c872fbd018a905cff8ac
Reviewed-on: http://review.couchbase.org/34995
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Subhashni Balakrishnan <b.subhashni@gmail.com>