Path changes (as discussed in other commit messages). All of the files
created by libsetup are now created in /var/emulab/boot; nothing is written into /etc/emulab or /usr/local/etc/emulab anymore. This was a requirement for jails, but is also a good thing to do anyway. There are a number of jail config changes to support the old vnodes and the new style jail vnodes; specifically, a setup routine to called from inside the jail when it first boots up to the get the usual assortmant of config info from tmcd. Also Merge local and remote update routines into one. Other various little changes for SFS and the MFS.