unit tests: MDL-20390 temporary work-around for this breakage, so other tests can...

diff --git a/course/simpletest/testexternal.php b/course/simpletest/broken_testexternal.php
similarity index 100%
rename from course/simpletest/testexternal.php
rename to course/simpletest/broken_testexternal.php

diff --git a/group/simpletest/testexternal.php b/group/simpletest/ broken_testexternal.php
similarity index 100%
rename from group/simpletest/testexternal.php
rename to group/simpletest/ broken_testexternal.php

diff --git a/user/simpletest/testexternal.php b/user/simpletest/broken_testexternal.php
similarity index 100%
rename from user/simpletest/testexternal.php
rename to user/simpletest/broken_testexternal.php