[YUNIKORN-1887] SI: Add tag to allow forcible app creation

Applications can be created in response to existing allocations
being reported from the shim to the core. We need to ensure that
these applications are not rejected.

scheduler-interface-spec.md

@@ -255,8 +255,7 @@ message AllocationRequest {
   // ID of RM, this will be used to identify which RM of the request comes from.
   string rmID = 3;
 
-  // Register new allocations or replace of existing allocations (if allocationID is same).
-  // The ask must already exist, or be specified in the asks parameter of this request.
+  // Existing allocations to be added.
   repeated Allocation allocations = 4;
 }
 
@@ -745,6 +744,7 @@ const (
 	AppTagNamespaceResourceQuota      = "namespace.resourcequota"
 	AppTagNamespaceResourceGuaranteed = "namespace.resourceguaranteed"
 	AppTagStateAwareDisable           = "application.stateaware.disable"
+	AppTagCreateForce                 = "application.create.force"
 	NodeReadyAttribute                = "ready"
 )
 ```

si.proto

@@ -84,8 +84,7 @@ message AllocationRequest {
   // ID of RM, this will be used to identify which RM of the request comes from.
   string rmID = 3;
 
-  // Register new allocations or replace of existing allocations (if allocationID is same).
-  // The ask must already exist, or be specified in the asks parameter of this request.
+  // Existing allocations to be added.
   repeated Allocation allocations = 4;
 }