Copy packages in/out of an installroot, for no downloads creating containers.
 A few cleanups for the fs sub-command:

. Add checks for diff/cpio/rpm2cpio.
. Add missing import for rpm, when override_install_langs isn't set.
. Allow users to run some of the commands.
. Map fs snap to fssnap command.
. Add translations and add messages when you alter the filters.
. Save config. file inside the chroot.
Choose yum.conf correctly for fs filter saving.
Merge branch 'master' of ssh://yum.baseurl.org/srv/projects/yum/git/yum

* 'master' of ssh://yum.baseurl.org/srv/projects/yum/git/yum: (2 commits)
  Copy packages in/out of an installroot, for no downloads creating containers.
  ...

 Screwed up double commit.

Conflicts:
	yumcommands.py
Fix repo-pkgs check-update not showing any updates.