Test-runner: minor fixes.

Test runner: improve cleanup when installing a new server
(remove more old stuff).
Do not leave around a .reject file if there are valgrind
errors only (it's useless).

test/lib/tarantool_silverbox_server.py

@@ -97,6 +97,8 @@ class TarantoolSilverboxServer:
                       glob.glob(os.path.join(vardir, "*.inprogress")) +
                       glob.glob(os.path.join(vardir, "*.xlog")) +
                       glob.glob(os.path.join(vardir, "*.cfg")) +
+                      glob.glob(os.path.join(vardir, "*.log")) +
+                      glob.glob(os.path.join(vardir, "*.core.*")) +
                       glob.glob(os.path.join(vardir, "core"))):
         os.remove(filename)
     else:

test/lib/test_suite.py

@@ -150,6 +150,7 @@ class Test:
         self.print_unidiff()
         where = ": wrong test output"
       elif not self.is_valgrind_clean:
+        os.remove(self.reject)
         self.print_diagnostics(self.suite_ini["valgrind_log"],
                                "Test failed! Last 10 lines of valgrind.log:")
         where = ": there were warnings in valgrind.log"