Katello-remove fails when interacting with any mounted filesystem

Issue

Katello-remove doesn't deal well with mounted file systems.

root@apsrd01871:/root
# katello-remove -y

Starting removal

Stopping services

Removing RPMs

Cleaning up configuration files

Cleaning up log files
/usr/share/ruby/fileutils.rb:1433:in `rmdir': Device or resource busy - /var/log/candlepin (Errno::EBUSY)
        from /usr/share/ruby/fileutils.rb:1433:in `block in remove_dir1'
        from /usr/share/ruby/fileutils.rb:1444:in `platform_support'
        from /usr/share/ruby/fileutils.rb:1432:in `remove_dir1'
        from /usr/share/ruby/fileutils.rb:1425:in `remove'
        from /usr/share/ruby/fileutils.rb:770:in `block in remove_entry'
        from /usr/share/ruby/fileutils.rb:1481:in `postorder_traverse'
        from /usr/share/ruby/fileutils.rb:768:in `remove_entry'
        from /usr/share/ruby/fileutils.rb:626:in `block in rm_r'
        from /usr/share/ruby/fileutils.rb:622:in `each'
        from /usr/share/ruby/fileutils.rb:622:in `rm_r'
        from /sbin/katello-remove:182:in `remove'
        from /sbin/katello-remove:233:in `<main>'

You also can't run katello-remove again unless you install katello-common again.

If I umount the 3 mounted file systems then it will run.

root@apsrd01871:/
# umount /var/log/httpd
root@apsrd01871:/
# umount /var/log/candlepin
root@apsrd01871:/
# umount /var/cache/pulp
root@apsrd01871:/
# katello-remove -y

Starting removal

Stopping services

Removing RPMs

Cleaning up configuration files

Cleaning up log files

Cleaning up certs

Cleaning up content

Removing Databases and Pulp storage on Filesystem

 /var/lib/mongodb is part of a mounted filesystem, skipping. You will need to remove /var/lib/mongodb manually.

 /var/lib/pgsql is part of a mounted filesystem, skipping. You will need to remove /var/lib/pgsql manually.

 /var/lib/pulp is part of a mounted filesystem, skipping. You will need to remove /var/lib/pulp manually.

Finished
root@apsrd01871:/
#
CONTENT = [
  '/opt/puppetlabs',
  '/opt/theforeman',
  '/root/.cache/apipie_bindings',
  '/root/.hammer',
  '/usr/lib/pulp',
  '/usr/libexec/foreman-proxy',
  '/usr/share/candlepin',
  '/usr/share/foreman-installer-katello',
  '/usr/share/foreman-installer',
  '/usr/share/foreman-proxy',
  '/usr/share/foreman',
  '/usr/share/katello-installer-base',
  '/usr/share/katello',
  '/usr/share/pulp',
  '/usr/share/puppet',
  '/usr/share/qpid-tools',
  '/usr/share/qpid',
  '/usr/share/tomcat',
  '/var/cache/',
  '/var/lib/candlepin',
  '/var/lib/foreman-maintain',
  '/var/lib/foreman',
  '/var/lib/katello',
  '/var/lib/puppet',
  '/var/lib/qpidd',
  '/var/lib/tomcat',
  '/var/opt/theforeman',
  '/var/tmp/foreman-proxy'
]

CONTENT is missing /var/lib/foreman-proxy

I think it should also be able to clean up the contents of the mounted file systems.
It lists them in katello-remove:

MOUNTS = [
  '/var/lib/mongodb',
  '/var/lib/pgsql',
  '/var/lib/pulp'
]

I would think it should dynamically figure out what is mounted and just clean it out and do the right thing. I would also be okay if it wants to give me a list that I need to manually clean up, just don't fail.