Description of problem:
When installing some packs like sun, acroread etc which are not signed one has
to disable gpgcheck in yum.conf, which sometimes leads to being left in that
order. This poses a risk.

In my view yum should have a command line switch to disable gpgcjeck for that
particular invocation so that yum.conf is not disturbed and also if gpgcjeck is
disabled then a warning message whould be displayed to the user.

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