Test old and new Gerrit

This change updates the CI testing for git-review to test with Gerrit
3.4.4 and 3.7.1. This should give us good coverage of new and old Gerrit
behavior when making changes to git-review.

Note we leave 3.4.4 as the default in the test suite for local runs to
try and limit possibility of breaking old Gerrit when adding features to
git-review for new Gerrit.

Change-Id: I4a42eddec1e247cbb0af5e74b8f1cee0ad58a79a

.zuul.yaml

@@ -1,3 +1,27 @@
+- job:
+    name: nox-py36-gerrit-default
+    parent: nox-py36
+    nodeset: ubuntu-bionic
+
+- job:
+    name: nox-py36-gerrit-371
+    parent: nox-py36-gerrit-default
+    vars:
+      nox_environment:
+        WAR_URL: 'https://gerrit-releases.storage.googleapis.com/gerrit-3.7.1.war'
+
+- job:
+    name: nox-py311-gerrit-default
+    parent: nox-py311
+    nodeset: ubuntu-jammy
+
+- job:
+    name: nox-py311-gerrit-371
+    parent: nox-py311-gerrit-default
+    vars:
+      nox_environment:
+        WAR_URL: 'https://gerrit-releases.storage.googleapis.com/gerrit-3.7.1.war'
+
 - project:
     vars:
       release_python: python3
@@ -7,10 +31,10 @@
       jobs: &jobs
         - build-python-release
         - nox-linters
-        - nox-py36:
-            nodeset: ubuntu-bionic
-        - nox-py311:
-            nodeset: ubuntu-jammy
+        - nox-py36-gerrit-default
+        - nox-py36-gerrit-371
+        - nox-py311-gerrit-default
+        - nox-py311-gerrit-371
     gate:
       jobs: *jobs
     promote:

git_review/tests/__init__.py

@@ -37,9 +37,11 @@ else:
     urlparse = urllib.parse.urlparse
 
 
-WAR_URL = 'https://gerrit-releases.storage.googleapis.com/gerrit-3.4.4.war'
+DEFAULT_WAR_URL = 'https://gerrit-releases.storage.googleapis.com/' \
+                  'gerrit-3.4.4.war'
 # Update GOLDEN_SITE_VER for every change altering golden site, including
-# WAR_URL changes. Set new value to something unique (just +1 it for example)
+# DEFAULT_WAR_URL changes. Set new value to something unique (just +1 it for
+# example).
 GOLDEN_SITE_VER = '7'
 
 
@@ -108,12 +110,12 @@ class IsoEnvDir(DirHelpers, fixtures.Fixture):
 
 
 class GerritHelpers(DirHelpers):
-
     def init_dirs(self):
         self.primary_dir = os.path.abspath(os.path.curdir)
         self.gerrit_dir = self._dir('primary', '.gerrit')
         self.gsite_dir = self._dir('gerrit', 'golden_site')
-        self.gerrit_war = self._dir('gerrit', WAR_URL.split('/')[-1])
+        self.war_url = os.environ.get('WAR_URL', DEFAULT_WAR_URL)
+        self.gerrit_war = self._dir('gerrit', self.war_url.split('/')[-1])
 
     def ensure_gerrit_war(self):
         # check if gerrit.war file exists in .gerrit directory
@@ -121,8 +123,8 @@ class GerritHelpers(DirHelpers):
             os.mkdir(self.gerrit_dir)
 
         if not os.path.exists(self.gerrit_war):
-            print("Downloading Gerrit binary from %s..." % WAR_URL)
-            resp = requests.get(WAR_URL)
+            print("Downloading Gerrit binary from %s..." % self.war_url)
+            resp = requests.get(self.war_url)
             if resp.status_code != 200:
                 raise RuntimeError("Problem requesting Gerrit war")
             utils.write_to_file(self.gerrit_war, resp.content)