Monitor warden.sock as part of dea health check

Make sure clients can connect to /var/vcap/data/warden/warden.sock.  The
existing health check against the http port is good but it doesn't cover
the actual path used by the dea to connect to warden.
Merge pull request #296 from sykesm/monit-warden-socket

Monitor warden.sock as part of dea health check
Revert "Merge pull request #296 from sykesm/monit-warden-socket"

This reverts commit 05ba6b0e019cd7fc9064de5971a0db282f39afb3, reversing
changes made to fd7bc709bcee094f471d6a7a59befdc7a6cb51c9.

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Merge branch 'master' into develop
Revert "Revert "Merge pull request #296 from sykesm/monit-warden-socket""

This reverts commit 16cd0e57ce2b1b3ae7361bae4b7044621531eb08.