Add phar integration tests #478

Job	Run time
Code coverage (codecov)	24s
CI test (make validate)	37s
Build moodle-plugin-ci.phar	47s
Integration tests (8.2, master)	2m 25s
Integration tests (8.2, MOODLE_402_STABLE)	2m 24s
Integration tests (8.1, MOODLE_401_STABLE)	2m 25s
Integration tests (8.0, MOODLE_400_STABLE)	2m 26s
Integration tests (8.0, MOODLE_311_STABLE)	2m 24s
Integration tests (7.4, MOODLE_310_STABLE)	2m 28s
Integration tests (7.4, MOODLE_39_STABLE)	2m 25s
Integration tests (7.4, MOODLE_38_STABLE)	2m 25s
Integration tests (PHAR) (8.2, master)	1m 29s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	1m 28s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	1m 16s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	1m 32s
	26m 55s

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