pgbuildfarm - client-code: - quote config opts so they can contain

Log Message:
-----------

- quote config opts so they can contain funny chars without upsetting the shell
  (markw noticed bug)
- add branch to example ccache dir for better hit rates (but more space use)
- add REL8_0_STABLE branch to port settings, and rearrange

Modified Files:
--------------
    client-code:
        build-farm.conf (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/build-farm.conf.diff?r1=1.5&r2=1.6)
        run_build.pl (r1.18 -> r1.19)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/run_build.pl.diff?r1=1.18&r2=1.19)