Run a few more tests in isolated processes.

These tests also interact with session ini values, which now need to use
a separate process because of changes in PHP7.2

tests/TestCase/Http/RequestTransformerTest.php

@@ -266,6 +266,7 @@ class RequestTransformerTest extends TestCase
      * Test that the transformed request sets the session path
      * as expected.
      *
+     * @runInSeparateProcess
      * @return void
      */
     public function testToCakeBaseSessionPath()

tests/TestCase/Http/ServerRequestFactoryTest.php

@@ -122,6 +122,7 @@ class ServerRequestFactoryTest extends TestCase
     /**
      * Test fromGlobals includes the session
      *
+     * @runInSeparateProcess
      * @return void
      */
     public function testFromGlobalsUrlSession()