heartbeat db2 agent support for rgmanager cluster manager

We would like to manage db2 resources with rgmanager using the heartbeat db2 agent.  The heartbeat db2 agent supports HADR, which requires a multi-state resource. Since rgmanager does not support multi-state resources, we've created a rgmanager specific db2 agent wrapper that limits the agents feature set to the Standard non-HADR role.

A few minor changes were made to support the limited feature set imposed by the rgmanager db2 wrapper in the heartbeat db2 agent.  None of these changes should affect previous use-cases of the heartbeat db2 agent.