build: Replace /var/run with /run
/var/run is a symlink to /run since RHEL 7, and few year before that on
Fedora. rpmlint is complaining in Fedora that we still use it:
sanlock.x86_64: E: dir-or-file-in-var-run /var/run/sanlock
Replace all instance of /var/run with /run.
Signed-off-by: Nir Soffer <nsoffer@redhat.com>