Trying to resolve some unit-test failures

Only happening on cloudbees jenkins. Seems to be caused by multiple tests running concurrently and causing conflicts with ThreadLocalS.

build.gradle

@@ -36,4 +36,9 @@ subprojects {
     tasks.withType(Javadoc).each {
         it.classpath = sourceSets.main.compileClasspath
     }
+
+    test {
+        forkEvery = 1
+        maxParallelForks = 1
+    }
 }