Workaround .pem being removed by redhat-upgrade-tool --clean

This patch temporarily moves the location of the downloaded .pem file
until problems in the order of redhat-upgrade-dracut upgrade-post hooks
can be fixed.

From: Jakub Dorňák <jdornak@redhat.com>

Related: rhbz#1071902
Always create the upgrade.conf directory

This fixes the problem of the directory not being present when using
--skipkernel.

Related: rhbz#1070603
Copy upgrade.conf to /root/preupgrade

This works around the problem of upgrade.conf being removed by
redhat-upgrade-tool --clean before the postupgrade scripts can be run.

Related: rhbz#1070603
Revert "Don't cleanup upgrade.conf for now"

This reverts commit b8529226652c1ead392d594f2e911e051840afa6. This
workaround was not effective since redhat-upgrade-tool --clean is run
after redhat-upgrade-tool has been upgraded. upgrade.conf is now being
copied to /root/preupgrade as a workaround, so this change to the
--clean behavior is no longer needed.

Related: rhbz#1070603
New release 0.7.21