[ONOS-8117] Fix onos-check-components
[ONOS-8117] Fix onos-check-components

- Catch "not found" when command isn't ready
- Catch UNKNOWN state output, which used to be UNSATISFIED
- Print output when failing so stc logs give useful information

Change-Id: Iae3f19bfc1ce81035604da89a0ce99ac9dcdc525

opennetworkinglab/onos,gkatsikas/onos,gkatsikas/onos,opennetworkinglab/onos,opennetworkinglab/onos,opennetworkinglab/onos,gkatsikas/onos,gkatsikas/onos,opennetworkinglab/onos,opennetworkinglab/onos,gkatsikas/onos,gkatsikas/onos