Remove unused $MACS.

$MACS is no longer used in the script, it's declaration can be removed.

Change-Id: Ic0f47ae323a153942dbafb78a7cae74d33a7e31f
Add shebangs to devtest_*; make them executable

Change-Id: I3f8aa890f04244317f888608d75b40c75d062de5
Merge "Remove unused $MACS."
Merge "Add shebangs to devtest_*; make them executable"
Fix numbering in devtest doc

The "source cloudprompt" step is messing up the numbering of the
online documentation.  I believe that's because of the lack of
indentation on the command (which I assume should remain commented
out since it's only supposed to be run once), so this just adds
indentation.

Change-Id: Ib926a001ee2fbca4e7dae2d5563121795a5cfdaa
Add 'set -eu to devtest_.sh'

Just like devtest.sh we want to use 'set -eu' to help detect bugs.
-e exits out if a pipeline returns a non-zero status
-u exits out on unset variables

Change-Id: I2dae00bf912a6d767deb63b9d4f9d1bf02b4dd6d
Merge "Fix numbering in devtest doc"