Change the systemd unit file permissions created via
openafs.spec to be 0644 instead of 0755. Having the
systemd unit files be executable will trigger a systemd
warning.
FIXES 132662
Change-Id: I9f5111c855941528193aaabeb42bf1b732246a7e
Reviewed-on: http://gerrit.openafs.org/12174 Tested-by: BuildBot <buildbot@rampaginggeek.com> Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de> Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>