Refactored exception message

Author: mudit1289

tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/sort/impl/PipelinedSorter.java

@@ -1526,7 +1526,7 @@ private void incrementNumSpills() throws IOException {
     ++numSpills;
     if(spillFilesCountLimit != SPILL_FILES_COUNT_UNBOUNDED_LIMIT_VALUE && numSpills > spillFilesCountLimit) {
       throw new IOException("Too many spill files got created, control it with " +
-              "mapreduce.task.spill.files.count.limit, current value: " + spillFilesCountLimit +
+              "tez.runtime.spill.files.count.limit, current value: " + spillFilesCountLimit +
               ", current spill count: " + numSpills);
     }
   }

tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/sort/impl/dflt/DefaultSorter.java

@@ -1419,7 +1419,7 @@ private void incrementNumSpills() throws IOException {
     ++numSpills;
     if(spillFilesCountLimit != SPILL_FILES_COUNT_UNBOUNDED_LIMIT_VALUE && numSpills > spillFilesCountLimit) {
       throw new IOException("Too many spill files got created, control it with " +
-              "mapreduce.task.spill.files.count.limit, current value: " + spillFilesCountLimit +
+              "tez.runtime.spill.files.count.limit, current value: " + spillFilesCountLimit +
               ", current spill count: " + numSpills);
     }
   }

tez-runtime-library/src/test/java/org/apache/tez/runtime/library/common/sort/impl/TestPipelinedSorter.java

@@ -924,7 +924,7 @@ public void testSpillFilesCountBreach() throws IOException, NoSuchMethodExceptio
         String errorMessage = targetException.getMessage();
         if (errorMessage != null) {
           if(errorMessage.equals("Too many spill files got created, control it with " +
-                  "mapreduce.task.spill.files.count.limit, current value: 2, current spill count: 3")) {
+                  "tez.runtime.spill.files.count.limit, current value: 2, current spill count: 3")) {
             gotExceptionWithMessage = true;
           }
         }

tez-runtime-library/src/test/java/org/apache/tez/runtime/library/common/sort/impl/dflt/TestDefaultSorter.java

@@ -636,7 +636,7 @@ public void testSpillFilesCountBreach() throws IOException, NoSuchMethodExceptio
         String errorMessage = targetException.getMessage();
         if (errorMessage != null) {
           if(errorMessage.equals("Too many spill files got created, control it with " +
-                  "mapreduce.task.spill.files.count.limit, current value: 2, current spill count: 3")) {
+                  "tez.runtime.spill.files.count.limit, current value: 2, current spill count: 3")) {
             gotExceptionWithMessage = true;
           }
         }