cleanup controller when start fails

[engelmi]

Fixes: #730

When controller_start fails, the cleanup in controller_stop still needs to be executed to remove all initialized nodes.

[dougsland]

LGTM

[dougsland]

Not related to the patch.

        FAILED scripts/create_coverage_report.py::test_create_coverag_report - Exception: Error merging info files from each integration test: lcov: Need one of options -z, -c, -a, -e, -r, -l, --diff or --summary
        Use lcov --help to get usage information
        ============================== 1 failed in 2.86s ===============================
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

        stderr (7 lines)
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        Traceback (most recent call last):
          File "/var/tmp/tmt/run-001/plans/tier0/tree/bluechi_test/test.py", line 202, in run
            exec(ctrl_container, node_container)
          File "/var/tmp/tmt/run-001/plans/tier0/tree/scripts/create_coverage_report.py", line 42, in exec
            raise Exception(f"Error merging info files from each integration test: {output}")
        Exception: Error merging info files from each integration test: lcov: Need one of options -z, -c, -a, -e, -r, -l, --diff or --summary
        Use lcov --help to get usage information

[engelmi]

Not related to the patch.

        FAILED scripts/create_coverage_report.py::test_create_coverag_report - Exception: Error merging info files from each integration test: lcov: Need one of options -z, -c, -a, -e, -r, -l, --diff or --summary
        Use lcov --help to get usage information
        ============================== 1 failed in 2.86s ===============================
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

        stderr (7 lines)
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        Traceback (most recent call last):
          File "/var/tmp/tmt/run-001/plans/tier0/tree/bluechi_test/test.py", line 202, in run
            exec(ctrl_container, node_container)
          File "/var/tmp/tmt/run-001/plans/tier0/tree/scripts/create_coverage_report.py", line 42, in exec
            raise Exception(f"Error merging info files from each integration test: {output}")
        Exception: Error merging info files from each integration test: lcov: Need one of options -z, -c, -a, -e, -r, -l, --diff or --summary
        Use lcov --help to get usage information

Yes, seems like a hiccup of GH: https://github.com/eclipse-bluechi/bluechi/actions/runs/7816388198/job/21321858579#step:9:3201