Z-Wave: Node Deletion & Add Controller IsFailedNode

A Z-Wave node can only be deleted if its present in the controllers
"Failed List" resident in its own NVRAM.
Added the Z-Wave IsFailedNode Message Class.
Added new Failed status if the controller has it flagged as failed in
its own database.
This then allows a node to be deleted.
Visibility of the "Delete Node" button uses this new logic.
Z-Wave: Node Deletion - improve FailedNode logic

Remove unnecessary call to delete node xml - already done on success
event at controller level.
Allow a FAILED node to be set to alive again if packets are received
from it.
Heal process of failed nodes handled correctly.
Z-Wave: Failed Node - Add "Failed" boolean status

Added "Failed" status to config
Consolidated status info.
Removed the 'failed' status and changed the 'node stage' to provide the enum so the client side can see what state the device is in.
Move requestIsFailedNode to NetworkMonitor

To ensure always gets called when a node is marked as dead during
runtime.
Thanks to Chris for the advice!
Z-Wave: multi instance encap response handler fixed
Multi-instance command fixes.
Z-Wave: changed default endpoint value to 0.
Revert "Z-Wave: changed default endpoint value to 0."

This reverts commit eecd7c303d9b2976d6cf732f1154d7b231625af1.
Make association group names read-only
Initial modification to set default endpoint to 0.
This allows distinction over the multi-instance commands. Endpoints always start from 1, so a value of 0 can now be defined to use the non multi-instance version.
https://github.com/openhab/openhab/issues/1545, https://github.com/openhab/openhab/pull/1544,https://github.com/openhab/openhab/issues/1461
Manual merge from druciak@eecd7c3
https://github.com/openhab/openhab/issues/1545
Add Cooper Wiring RF9542-Z to Z-Wave product database
Add Cooper Wiring RF9542-Z to Z-Wave product database
Fix error in Z-Wave products.xml with Cooper Wiring RF9542-Z addition
Merge remote-tracking branch 'upstream/master' into zwave-cooper-rf9542z
Fix error in Z-Wave products.xml with Cooper Wiring RF9542-Z addition
added the leviton vrs15-1lz to the database
added alternative prdoct id
Merge pull request #1559 from mattgwatson/zwave-cooper-rf9542z

Add Cooper Wiring RF9542-Z to Z-Wave product database