Add whitespace around keywords

This fixes pep8 E275 which wants whitespace after assert and del.

Change-Id: I1f8659f462aa91c3fdf8f7eb8b939b67c0ce9f55

tests/unit/test_github_driver.py

@@ -1384,7 +1384,7 @@ class TestGithubDriver(ZuulTestCase):
         # now check if the merge was done via rebase
         merges = [report for report in self.fake_github.github_data.reports
                   if report[2] == 'merge']
-        assert(len(merges) == 1 and merges[0][3] == 'squash')
+        assert (len(merges) == 1 and merges[0][3] == 'squash')
 
     @simple_layout('layouts/basic-github.yaml', driver='github')
     def test_invalid_event(self):

zuul/driver/gerrit/gerritconnection.py

@@ -1470,7 +1470,7 @@ class GerritConnection(ZKChangeCacheMixin, ZKBranchCacheMixin, BaseConnection):
         # for large projects like nova
         alldata = []
         chunk, more_changes = _query_chunk(query, event)
-        while(chunk):
+        while chunk:
             alldata.extend(chunk)
             if more_changes is None:
                 # continue sortKey based (before Gerrit 2.9)

zuul/executor/server.py

@@ -3735,7 +3735,7 @@ class ExecutorServer(BaseMergeServer):
                 sensor.reportStats(self.statsd, base_key)
 
     def finishJob(self, unique):
-        del(self.job_workers[unique])
+        del self.job_workers[unique]
         self.log.debug(
             "Finishing Job: %s, queue(%d): %s",
             unique,