Obsolete python2 subpackage
This should fix transaction failure during upgrades:
Error: Transaction check error:
file /usr/bin/oslo_debug_helper from install of python3-oslotest-3.2.0-3.fc30.noarch conflicts with file from package python2-oslotest-3.2.0-1.fc29.noarch
file /usr/bin/oslo_run_cross_tests from install of python3-oslotest-3.2.0-3.fc30.noarch conflicts with file from package python2-oslotest-3.2.0-1.fc29.noarch
file /usr/bin/oslo_run_pre_release_tests from install of python3-oslotest-3.2.0-3.fc30.noarch conflicts with file from package python2-oslotest-3.2.0-1.fc29.noarch