Added health check for CouchDB

Change-Id: If2d32b2197162b5f04997ab71ba2d292701cd0b9
Signed-off-by: Saad Karim <skarim@us.ibm.com>
Signed-off-by: Matthew Sykes <sykesmat@us.ibm.com>
(cherry picked from commit 8768567a9c626b2feb533f3c4909d2243d44aac9)