bash_completion: complete .tar, tar.bz2 and tar.xz for --ostemplate

Commit 06cc8e045 added support for .bz2 and .xz templates.
But in autocompletion we were only doing .tar.gz.

Fix it.

Reported-by: Scott Dowdle <scott@montanalinux.org>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
1 file changed