Kill check_solr (at least in this form)

The check is really broken, keeping state between invocations in an
sqlite3 in a random place /var/lib and alerting only based on the errors
diff between invocations. Revert this for now, until a sensible version
of that appears (quick Googling suggests there are other idempotent
checks around)

Change-Id: I460b89a4c87d4595b4a17a2641dfbd03f26c78ea