pgbuildfarm - client-code: provide for "default" entry in force_every

Log Message:
-----------
provide for "default" entry in force_every setting

Modified Files:
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client-code:
build-farm.conf (r1.29 -> r1.30)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/build-farm.conf?r1=1.29&r2=1.30)
run_build.pl (r1.109 -> r1.110)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/run_build.pl?r1=1.109&r2=1.110)