Fix for older versions of python
Fix for older versions of python

Use the older syntax for exception variables; older versions
of python (like 2.4, which is installed on boss and ops right
now), don't support the 'Except X as (Y,Z)' syntax.

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