As per discussion yesterday with Mike, in an attempt to solve the bad
mcast addr problem, change the pick_address code so that it always adds one to the last address picked. Store the last used index in the emulab_indicies table (the table is seeded with the BASEADDR if there is no existing address, so external emulabs will be okay). With the lower three octets, it should be quite some time before we run out and have to start over (currently it sends email if this happens).
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