pkgdeps: install tar dependency

Amazingly enough it is possible to install Fedora without tar.  I
believe it is the minimal install that does not include tar.

If tar is not present then autoserv will fail to package tests and
produce various errors.

Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
Merge pull request #858 from rbbratta/tar-dep

pkgdeps: install tar dependency