Since NMRemoteSettings doesn't announce new connections until it has
fetched their properties, it's possible that a connection could get
deleted while we're waiting for it to be created. NMRemoteSettings has
code to deal with this, so add a test to make sure that it works.
test-nm-client.c and test-remote-settings-client.c were using their
own assertion macros so they could kill the test service on assertion
failure. Except that some new code didn't get the memo and used the
g_assert* macros. Not to mention that sometimes the tests would crash
outside of an assertion macro.
We can make test-networkmanager-service.py notice that its parent has
crashed by opening a pipe between them and taking advantage of the
fact that the pipe will be automatically closed if the parent crashes.
So then test-networkmanager-service.py just has to watch for that, and
exit if the pipe closes.
Then that lets us drop the test_assert* macros and just use g_assert*
instead.
Move libnm-glib's test-fake-nm.py and test-remote-settings-service.py
to tools/, merge them together into a single program, and fix a few
bugs (notably some missing signal emissions in the Settings service).
Although they are currently only used by libnm-glib's tests, they are
generic enough that they could be used by other code in the future
(and in particular, they will be used by libnm's tests as well).
