[test] Set exit code to 0 even with remaining tests

Bug: v8:6917
Change-Id: Ibc6a7e049a17b8f9bef6b2f5cb187c11f89cf638
Reviewed-on: https://chromium-review.googlesource.com/897564Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michał Majewski <majeski@google.com>
Cr-Commit-Position: refs/heads/master@{#51024}

tools/testrunner/num_fuzzer.py

@@ -179,8 +179,6 @@ class NumFuzzer(base_runner.BaseTestRunner):
 
     if results.failed:
       return 1
-    if results.remaining:
-      return 2
     return 0
 
   def _setup_suites(self, options, suites):

tools/testrunner/standard_runner.py

@@ -570,8 +570,6 @@ class StandardTestRunner(base_runner.BaseTestRunner):
       exit_code = 0
       if results.failed:
         exit_code = 1
-      if results.remaining:
-        exit_code = 2
       if not results.total:
         exit_code = 3