Silently ignore error about concurrent sweep instance when we try to run auto sweep

Author: Artyom Ivanov

src/jrd/tra.cpp

@@ -2756,6 +2756,9 @@ namespace {
 			status.check();
 
 			AutoRelease<IAttachment> att(prov->attachDatabase(&status, dbName.c_str(), dpbLen, dpbBytes));
+			if (fb_utils::containsErrorCode(status->getErrors(), isc_sweep_concurrent_instance))
+				return;
+
 			status.check();
 		}