Report git sha in status page version

If the installed version of Zuul is not a release, report the
git sha along with the version on the status page.

This is calculated at startup and so should not change during
the life of the process.

Change-Id: Ia48a3765f0dd7ef369b2b30ac1d79cc1f52045b6

zuul/scheduler.py

@@ -257,7 +257,11 @@ class Scheduler(threading.Thread):
             '/var/lib/zuul/scheduler.socket')
         self.command_socket = commandsocket.CommandSocket(command_socket)
 
-        self.zuul_version = zuul_version.version_info.release_string()
+        if zuul_version.is_release is False:
+            self.zuul_version = "%s %s" % (zuul_version.release_string,
+                                           zuul_version.git_version)
+        else:
+            self.zuul_version = zuul_version.release_string
         self.last_reconfigured = None
         self.tenant_last_reconfigured = {}
         self.autohold_requests = {}

zuul/version.py

@@ -15,6 +15,21 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import json
+
 import pbr.version
+import pkg_resources
 
 version_info = pbr.version.VersionInfo('zuul')
+release_string = version_info.release_string()
+
+is_release = None
+git_version = None
+try:
+    _metadata = json.loads(
+        pkg_resources.get_distribution('zuul').get_metadata('pbr.json'))
+    if _metadata:
+        is_release = _metadata['is_release']
+        git_version = _metadata['git_version']
+except Exception:
+    pass