In some client-server test cases, messages are supposed to be injected into
the instance 2(client), but they are actually injected into instance 1(server),
which may lead to false negative results. This patch fixed it by replacing
'injectmsg' with 'injectmsg2', and dealt with some minor issues.
Also now permit interactivly running tests without explicitly setting
$srcdir. This now works if we are inside ./tests and fails, as before,
when we are in a different directory.
Detected by shellcheck via CodeFactor.io
also prepared test case for TLS testing, but not activated it
inside the build itself.
A note on TLS testing: the current testsuite (in git!) already contains
TLS test cases. However, getting these test cases correct is not simple.
That's not a problem with the code itself, but rater a problem with
synchronization in the test environment. So I have deciced to keep the
TLS tests in, but not yet actually utilize them. This is most probably
left as an excercise for future (devel) releases.
