Add -noswapout option to prevent swapout after a botched swapmod.
Used by the pool daemon to keep the shared-nodes from getting released. Add call to new ReserveSharedBandwidth() when doing a swapmod recovery. See comment in Experiment.pm cvs log. Use the new snmpit -X option (synchronize tables) instead of vlan teardown and setup during a swapmod. This is currently enabled only on the MAINSITE and only for testbed/tbres/emulab-ops until we get some experience with it.
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