Combine both phpunit configs into one

Signed-off-by: Joas Schilling <coding@schilljs.com>

tests/phpunit.unit.xml

@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<phpunit bootstrap="bootstrap.php"
-		 verbose="true"
-		>
-	<testsuite name='Registration app tests'>
-		<directory suffix='Test.php'>Unit</directory>
-	</testsuite>
-	<!-- filters for code coverage -->
-	<filter>
-		<whitelist>
-			<directory suffix=".php">../</directory>
-		</whitelist>
-	</filter>
-</phpunit>

tests/phpunit.xml

@@ -4,6 +4,7 @@
 		>
 	<testsuite name='Registration app tests'>
 		<directory suffix='Test.php'>Integration</directory>
+		<directory suffix='Test.php'>Unit</directory>
 	</testsuite>
 	<!-- filters for code coverage -->
 	<filter>

tests/scripts/phpunit.sh

@@ -7,7 +7,6 @@ set -e
 cd ${BUILD_APP_MODULE_DIR}
 
 composer install --prefer-dist --no-interaction -o
-vendor/bin/phpunit -c tests/phpunit.unit.xml
-vendor/bin/phpunit -c tests/phpunit.integration.xml
+vendor/bin/phpunit -c tests/phpunit.xml
 
 echo "travis_fold:end:phpunit"