Rationalise the the use of "yum clean all" in postinstall scripts.

Using "yum clean all" before doing a "yum update" seems to avoid
certain weird problems.  We were doing a clean before an update in
both the basic postinstall (which is always present) and the
SoFS-postinstall.  However, this wasn't avoiding problems when a base
image was being used for some other purpose.  The current thinking is
to put a clean after the update in the basic postinstall - so this is
the last thing that happens when a base is created without the
SoFS-postinstall.  This should mean that, when a node is created using
the base, any updates will need to fetch fresh repo data... so the
update should be clean.

Signed-off-by: Martin Schwenke <martin@meltin.net>

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