Backfills network parsing specs for the job spec parser.

Still needs a lot more coverage, but we're doing this so that we at
least get some coverage of the calls to the methods defined in IpUtil.'

Signed-off-by: Matthew Boedicker <mboedicker@pivotallabs.com>
exit 1 when invalid cli option is given

Signed-off-by: Matthew Boedicker <mboedicker@pivotallabs.com>
Improve cli runner specs.

Signed-off-by: Matthew Boedicker <mboedicker@pivotallabs.com>
turned on rubocop for small portion of bosh-director

Signed-off-by: Matthew Boedicker <mboedicker@pivotallabs.com>