vdsm-reg-setup: fix logging call

_createUpgradeDir() uses log.error() which log is not defined.
This patch fix the call and moves the logging setup before
the _createUpgradeDir() call.

Change-Id: Id3efebe47d729422c6c9d9b23aaafc01d7bf9a2b
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1056981
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/26914
Reviewed-by: Dan Kenigsberg <danken@redhat.com>