SERVER-13620 fix assert codes to be the same as in 2.6

Author: milkie

src/mongo/db/background.cpp

@@ -97,7 +97,7 @@ namespace {
 
     void recordEndAndRemove(BgInfoMap* bgiMap, const StringData& key) {
         BgInfoMapIterator iter = bgiMap->find(key);
-        fassert(17443, iter != bgiMap->end());
+        fassert(17431, iter != bgiMap->end());
         if (0 == iter->second->recordEnd()) {
             bgiMap->erase(iter);
         }

src/mongo/db/catalog/collection.cpp

@@ -466,7 +466,7 @@ namespace mongo {
      * 4) re-write indexes
      */
     Status Collection::truncate() {
-        massert( 17431, "index build in progress", _indexCatalog.numIndexesInProgress() == 0 );
+        massert( 17445, "index build in progress", _indexCatalog.numIndexesInProgress() == 0 );
 
         // 1) store index specs
         vector<BSONObj> indexSpecs;