Add TBDateStringGMT() and TBDateStringLocal() to parse dates and return appropriate strings in the desired format. We have variants of these scattered around in too many places.
Add TBDateStringGMT() and TBDateStringLocal() to parse dates and return
appropriate strings in the desired format. We have variants of these
scattered around in too many places.

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