Support a list of hosts in RPC server_params

Change-Id: I2c45500476a55e4906818755fdd8547c09d86611
Support a list of hosts in rpc_host cell db field

Change-Id: I0a29d13507362653497de8df105840be5f0d3d1e
Added simple ip filtering to fix #2848

This filtering will do regular expression matches so when searching for
absolute ip addresses, a dollar sign will be required to terminate the
string.

Change-Id: Ib5748d22d723279df31911e787239cc34f2f19fc