correct typo and add note about vm universe being different than running
HTCondor on an existing/running virtual machine
===GT=== #2433
edit and fix typos and update (no more references to MPI universe)
sections 3.12.8.1-3
===GT=== #2433
Merge branch 'V8_0-branch' of /p/condor/repository/CONDOR_SRC into V8_0-branch