Description of problem:
redhat-upgrade-tool doesn't check existence of /var/lib/systemd and fall when doesn't exists with --clean option.


Version-Release number of selected component (if applicable):
redhat-upgrade-tool-0.7.24-1.el6.noarch

How reproducible:
always

Steps to Reproduce:
redhat-upgrade-tool --clean
redhat-upgrade-tool --clean


Actual results:
Traceback (most recent call last):
  File "/usr/bin/redhat-upgrade-tool", line 325, in <module>
    main(args)
  File "/usr/bin/redhat-upgrade-tool", line 107, in main
    do_cleanup(args)
  File "/usr/lib/python2.6/site-packages/redhat_upgrade_tool/commandline.py", line 228, in do_cleanup
    for cert in filter(lambda fn: fn.endswith('.pem'), os.listdir(packagedir)):
OSError: [Errno 2] No such file or directory: '/var/lib/system-upgrade'

Expected results:


Additional info: