Do not leave SQLite DB files at the end of perf tests if no error happened

tools/matrix

@@ -108,9 +108,11 @@ class MatrixImportBenchmark(BenchmarkRunner):
                     self._size = size
                 else:
                     assert self._size == size
-                return end - start
             finally:
                 neo.stop()
+            # Clear DB if no error happened.
+            neo.setupDB()
+            return end - start
         except:
             traceback.print_exc()
             self.error_log += "Import with m=%s, s=%s, r=%s, p=%s:" % (

tools/perfs

@@ -47,18 +47,18 @@ class ImportBenchmark(BenchmarkRunner):
             master_count=config.masters,
             verbose=False,
         )
-
         # import datafs
-        neo.start()
         try:
+            neo.start()
             try:
-                return self.buildReport(*self.runImport(neo))
-            except:
-                summary = 'Perf : import failed'
-                report = ''.join(traceback.format_exc())
-                return summary, report
+                result = self.buildReport(*self.runImport(neo))
             finally:
                 neo.stop()
+            # Clear DB if no error happened.
+            neo.setupDB()
+            return result
+        except:
+            return 'Perf: import failed', ''.join(traceback.format_exc())
 
     def runImport(self, neo):