Fix core unit tests failing

[djarran]

Description: This applies the fixes outlined in #394. This fails this test with the following error message:

1) externallib_test::test_get_courses_by_field
Failed asserting that actual size 7 matches expected size 6.

/var/www/site/course/tests/externallib_test.php:2800
/var/www/site/lib/phpunit/classes/advanced_testcase.php:80

This proposed fix allows the unit test to be ran successfully

[kaltura-hooks]

Hi @djarran,
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[golenkovm]

Hi @kaltura-hooks and Kaltura team,

Is there a chance this could be integrated? The patch looks to be spot on.

Kind regards,
Misha