[test] Replace assertFalse(array_key_exists) with assertArrayNotHasKey
[test] Replace assertFalse(array_key_exists) with assertArrayNotHasKey

akrabat/zend-stdlib,MadCat34/zend-stdlib,php-refactoring/zend-array-utility,ezimuel/zend-stdlib,weierophinney/zend-stdlib,adamlundrigan/zend-stdlib,sravanchandj/zend-stdlib