Fix up verbiage on what privs that project_root and group_root have wrt subgroups. Also noted that group created is no longer in the group by default.
Fix up verbiage on what privs that project_root and group_root have
wrt subgroups. Also noted that group created is no longer in the group
by default.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome