[System Redundancy] Unexpected check indications generated on ARSet status change

In case System Redundancy, unexpected PNS_IF_CHECK_IND indicating an "unused submodule" may be reported to the application on each ARSet status change except on switch over.

It's expected that check indications may only be reported in the following scenarios:

• First SR-AR is being established  (ARset established)
• Last SR-AR is being aborted (ARset released)
• Dynamic reconfiguration sequence, former primary SR-AR is aborted (this is necessary to report check ind when a submodule is removed from ARset configuration)
• Dynamic Reconfiguration sequence, while changing OWNER of submodules when new established AR (with new ARset configuration) becomes primary.