Add additional info into diagnostic snapshot

* pack all /var/log/atop/atop* files from all nodes
* command output for 'pcs status' from controllers
* command output for 'rabbitmqctl report' from controllers
* command output cat /proc/interrupts from all nodes

Change-Id: Ic22b32e31b002ae7334a6c12d648ac6354379acd
Closes-Bug: #1389155
Merge "Add additional info into diagnostic snapshot"