Minor change for case that OPS is a jail on boss; when asked to ssh to USERNODE, shortcut to exec only, without the ssh.
Minor change for case that OPS is a jail on boss; when asked to ssh to
USERNODE, shortcut to exec only, without the ssh.

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