[archive] introduce py2.6 TarFile compat wrapper

Python 2.6 lacks the filter parameter to TarFile.add() that the
TarFileArchive uses to preserve permissions on archive content.

Work around this by creating a wrapper class that implements the
missing functionality (duplicated from the py2.7.5 tarfile.py)
and use it whenever running on a python version less than 2.7.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

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