Fix tests for MariaDB.

MariaDB 10.1 returns a slightly different error message than MySQL Server 5.7.

Author: bgrainger

tests/SideBySide/BulkLoaderAsync.cs

@@ -157,7 +157,8 @@ public async Task BulkLoadCsvFileNotFound()
 				}
 				else
 				{
-					Assert.Contains("Errcode: 2 - No such file or directory", mySqlException.Message);
+					Assert.Contains("Errcode: 2 ", mySqlException.Message);
+					Assert.Contains("No such file or directory", mySqlException.Message);
 				}
 			}
 		}

tests/SideBySide/BulkLoaderSync.cs

@@ -159,7 +159,8 @@ public void BulkLoadCsvFileNotFound()
 				}
 				else
 				{
-					Assert.Contains("Errcode: 2 - No such file or directory", mySqlException.Message);
+					Assert.Contains("Errcode: 2 ", mySqlException.Message);
+					Assert.Contains("No such file or directory", mySqlException.Message);
 				}
 			}
 		}