Fix sentry reporting to use git sha for release

If there's no version (tag name), use the git commit sha as the release
in sentry reporting. This makes it easier to figure out bugs when we're
auto-deploying to stage when things land in the master branch.

ichnaea/log.py

@@ -89,7 +89,8 @@ def configure_raven(transport=None, _client=None):
 
     dsn = settings("sentry_dsn")
     klass = DebugRavenClient if not dsn else RavenClient
-    release = version_info()["tag"]
+    info = version_info()
+    release = info.get("version") or info.get("commit") or "unknown"
     client = klass(dsn=dsn, transport=transport, release=release)
     return client
 

version.json

@@ -1,7 +1,6 @@
 {
-    "build": null,
-    "commit": "HEAD",
     "source": "https://github.com/mozilla/ichnaea",
-    "tag": "master",
-    "version": "dev"
+    "version": "unknown",
+    "commit": "HEAD",
+    "build": "unknown"
 }