Test result key should be implemented as enum, not a string

[happz]

This is a leftover from transitioning to enums in the past.

Pull Request Checklist

• implement the feature

[psss]

Thanks for cleaning this up!

[psss]

Seems we have a little regression:

:: [ 08:12:17 ] :: [  BEGIN   ] :: Running 'tmt tests show mini'
/tests/mini
                    test ./test.sh
                    path /tests
               framework shell
                  manual false
                     tty false
                duration 5m
                 enabled true
                  result ResultInterpret.RESPECT
       restart_max_count 1
     restart_with_reboot false

:: [ 08:12:18 ] :: [   FAIL   ] :: File '/var/tmp/rlRun_LOG.H4A4Jrdi' should contain 'result respect' 

[happz]

Seems we have a little regression:

:: [ 08:12:17 ] :: [  BEGIN   ] :: Running 'tmt tests show mini'
/tests/mini
                    test ./test.sh
                    path /tests
               framework shell
                  manual false
                     tty false
                duration 5m
                 enabled true
                  result ResultInterpret.RESPECT
       restart_max_count 1
     restart_with_reboot false

:: [ 08:12:18 ] :: [   FAIL   ] :: File '/var/tmp/rlRun_LOG.H4A4Jrdi' should contain 'result respect' 

Addressed in bad555b

[psss]

Failing test is an unrelated Unrecognized package manager. error, merging.