tests: make hghave and run-tests exit on unknown feature requirements

tests/hghave

@@ -59,7 +59,7 b" if __name__ == '__main__':"
 
         if feature not in checks:
             error('skipped: unknown feature: ' + feature)
-            continue
+            sys.exit(2)
 
         check, desc = checks[feature]
         try:

tests/run-tests.py

@@ -602,10 +602,13 b' def tsttest(test, wd, options, replaceme'
         tdir = TESTDIR.replace('\\', '/')
         proc = Popen4('%s -c "%s/hghave %s"' %
                       (options.shell, tdir, ' '.join(reqs)), wd, 0)
-        proc.communicate()
+        stdout, stderr = proc.communicate()
         ret = proc.wait()
         if wifexited(ret):
             ret = os.WEXITSTATUS(ret)
+        if ret == 2:
+            print stdout
+            sys.exit(1)
         return ret == 0
 
     f = open(test)