[Solidfire] Fix zone wide storage access support for VM migrations

Author: nvazquez

plugins/storage/volume/solidfire/src/main/java/org/apache/cloudstack/storage/datastore/driver/SolidFirePrimaryDataStoreDriver.java

@@ -1677,4 +1677,9 @@ public void detachVolumeFromAllStorageNodes(Volume volume) {
     public boolean volumesRequireGrantAccessWhenUsed() {
         return true;
     }
+
+    @Override
+    public boolean zoneWideVolumesAvailableWithoutClusterMotion() {
+        return true;
+    }
 }