Remove Erlang runtime on Fedora

Cleaning up after a rabbitmq install sometimes needs to get radical;
we've been nuking it in clean.sh for a long time, Fedora needs the
same help.

Change-Id: Ie4b9aa402a21cdfd73682f0f178d5a22ae046b84
Merge branch 'review/afazekas/fixup-stuff' into dt-test
Merge branch 'local-vars-accounts' into dt-test
Merge branch 'local-vars-cinder' into dt-test
Merge branch 'local-vars-horizon' into dt-test
Merge branch 'local-vars-keystone' into dt-test
Merge branch 'local-vars-misc' into dt-test
Merge branch 'local-vars-swift' into dt-test
Merge branch 'maintainers' into dt-test
Merge branch 'cinder-backend-solidfire' into dt-test
Merge branch 'cinder-backend-netapp' into dt-test
Merge branch 'erlang-b-gone' into dt-test
Merge branch 'conf-tempest' into dt-test
Merge branch 'test-service-functions' into dt-test
Merge branch 'exercise-refresh' into dt-test