NSHM Unit tests

When running NSHM unit tests in pipeline, instead of running the hazard calculation in the junit test itself the hazard calculation is done by running a java class and writing out the results to JSON files.

gradle/nshm.gradle

@@ -140,10 +140,10 @@ task testConus2018(type: Test) {
   }
 
   useJUnitPlatform()
-  jvmArgs(
-      "-Xms2g",
-      "-Xmx${xmx}",
-      )
+  // jvmArgs(
+  //     "-Xms2g",
+  //     "-Xmx${xmx}",
+  //     )
 
   filter {
     includeTestsMatching "gov.usgs.earthquake.nshmp.model.NshmTests.testConus2018"