More plab updates/changes
* implemented PLC slice renewal * restructured daemon code/startup - removed getfree daemon (replaced by plabdiscover; run from cron) - moved generic daemonizing code into libtestbed (class) - created plabrenewd - small script that utilizes daemonizing class - removed plabdaemon file. - updated bossnode startup scripts * changed slice prefix - PLC denies permission w/ anything other than "utah" * Minor semantic changes to module API to be more consistent with other parts. * Some bug fixes.
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