Implemented active checks, reverted test case, minor javadoc nit

- Added ACTIVE checks to all routes in AdminSparkServer using VeniceParentControllerRegionStateHandler wrapper class
- Reverted CreateVersionTest to previous commit without ParentControllerRegionState.ACTIVE
- Removed some minor parentheses in ParentControllerRegionState

Author: bonytoni

services/venice-controller/src/main/java/com/linkedin/venice/controller/ParentControllerRegionState.java

@@ -2,8 +2,8 @@
 
 /**
  * Enum representing the state of the region where the parent controller resides.
- * (i.e., Region dc-0 is ACTIVE while Region dc-1 is PASSIVE
- * This means that ParentController in dc-0 is serving requests while ParentController in dc-1 is rejecting requests)
+ * i.e., Region dc-0 is ACTIVE while Region dc-1 is PASSIVE
+ * This means that ParentController in dc-0 is serving requests while ParentController in dc-1 is rejecting requests
  */
 public enum ParentControllerRegionState {
   /** The region is active, so the parent controller in the region is serving requests */