Remove restriction for max parallel forks for gradle tests

build.gradle

@@ -19,12 +19,6 @@ task wrapper(type: Wrapper) {
     gradleVersion = '2.2.1'
 }
 
-subprojects {
-    tasks.withType(Test) {
-        maxParallelForks = 1
-    }
-}
-
 // Ignore tests for external dependency
 project(':extern:spongycastle') {
     subprojects {