tests: More useful output of make check

Instead of spilling thousands of lines of output, make check now runs the
test-suite in about 100 lines or so.  If running under make check, the output of
tests is reduced. The MAKE_CHECK environment variable is used for this, so that
when running the test manually, the full output is still shown.  Furthermore,
pa_log is used consistently instead of printf, so that all test output goes to
stderr by default.  Colored output from make check goes to stdout.

src/tests/lock-autospawn-test.c

@@ -103,7 +103,5 @@ int main(int argc, char**argv) {
     pa_thread_free(c);
     pa_thread_free(d);
 
-    pa_log("End");
-
     return 0;
 }