make: prepare for adding transcript tests

Separate 'make python-test' into separate make targets, to sensibly add VTY
transcript tests in an upcoming commit.

Feature: even though ./configure was called without --enable-external-tests,
each of the {ctrl,vty}x{python,transcript} tests can be invoked individually by
e.g. 'make vty-python-test'.

Both 'vty-transcript-test' and 'ctrl-transcript-test' are still empty, a
subsequent patch adds a vty-transcript-test.

All of this in preparation of tweaking the 'mncc' vty configuration, to be able
to track it in a vty transcript test.

Change-Id: I688657e56ae469c07b9f25ba37275d38dbd457e2
1 file changed