during check Differeniate between a resources not existing, being locked, or being in maintaince mode

[pgagne]

Right now rlock --check does not seam to differeanite in its message or exit code between.

1. A resource name or label not being found
2. a resource that does exist but is in maintaince mode
3. a resource that is locked

all three cases print this message:

{'CONNECTION': 'OK'}
No resource available.

This is quite confusing, especially when your using it a lot when you give it a mistyped label.

Different error messages for these three cases, should be printed, perhaps with there own exit codes.