#2998 clm: send PLM response if node down comes

[Alex Jones]

If a LOCK admin command from PLM is issued on a HE or EE, CLM sends a tracking request to AMF to validate and start the shutdown. When the START track is sent CLM waits for a response from AMF. Because the request is coming from PLM, the time supervision is set to UNKNOWN, which means the response has no time limit.

If the node crashes before AMF responds to CLM, then PLM never gets a response from CLM and doesn't transition the EE or HE to LOCKED state. CLM needs to send a response to PLM if it detects node down and there is a pending PLM operation on that node, and no response has yet been sent back to PLM.

[Alex Jones]

commit 101c25629e8ac09216cf7c3449ec30f32e2329a5 (origin/develop)
Author: Alex Jones ajones@rbbn.com
Date: Mon Jan 21 10:59:07 2019 -0500