Check for process network mode consistency

[vrragosta]

Checks to ensure all compute and drives processes have equivalent network modes.

[vrragosta]

Hmm - is this markedly better than doing

weka cluster process -F role=${ROLE} -o netmode --no-header | sort | uniq | wc -l

and seeing if you get more than 1?

Hmm...no :)

This is addressed in the latest commit.

[jackchallen]

LGTM