[MINOR] Fix federated tests and codegen components for fixed IDSequence

Author: mboehm7

src/main/java/org/apache/sysds/hops/codegen/template/TemplateUtils.java

@@ -539,7 +539,7 @@ public static int getMaxLiveVectorIntermediates(CNode node, CNode main, Map<Long
 
 	public static boolean isValidNumVectorIntermediates(CNode node, CNode main, Map<Long, Set<Long>> parents, Map<Long, Pair<Long, MutableInt>> inUse, Set<Long> inUse2, int count) {
 		if( count <= 1 ) return false;
-		IDSequence buff = new IDSequence(true, count-1); //zero based
+		IDSequence buff = new IDSequence(true, count-2); //-1 based
 		inUse.clear(); inUse2.clear();
 		node.resetVisitStatus();
 		return rIsValidNumVectorIntermediates(node, main, parents, inUse, inUse2, buff);

src/test/java/org/apache/sysds/test/functions/federated/primitives/part2/FederatedNegativeTest.java

@@ -64,7 +64,7 @@ public void NegativeTest1() {
 		try {
 			FederatedResponse fres = res[0].get();
 			assertFalse(fres.isSuccessful());
-			assertTrue(fres.getErrorMessage().contains("Variable 1 does not exist at federated worker"));
+			assertTrue(fres.getErrorMessage().contains("Variable 0 does not exist at federated worker"));
 		}
 		catch (Exception e) {
 			e.printStackTrace();