Devserver: have a separate ObjectStore namespace (both memcache and datastore)

Devserver: have a separate ObjectStore namespace (both memcache and datastore)
for each version of the server. Without this, it's impossible to safely roll
back the server since the data format and/or content might have changed.

This also make the _VERSION stuff moot since updating the server will give
everything a new namespace. Since we only run this stuff in cronjobs there will
only be a performance impact there, which doesn't really matter.

BUG=167432
NOTRY=true

[not at google - send to devlin, 2013-04-22 16:43:37]

https://codereview.chromium.org/14267024/diff/5001/chrome/common/extensions/d...
File chrome/common/extensions/docs/server2/api_list_data_source.py (left):

https://codereview.chromium.org/14267024/diff/5001/chrome/common/extensions/d...
chrome/common/extensions/docs/server2/api_list_data_source.py:17: ]
devtools got deleted a while ago, cleanup

https://codereview.chromium.org/14267024/diff/5001/chrome/common/extensions/d...
File chrome/common/extensions/docs/server2/object_store_creator.py (right):

https://codereview.chromium.org/14267024/diff/5001/chrome/common/extensions/d...
chrome/common/extensions/docs/server2/object_store_creator.py:13: def
__init__(self, app_version, branch):
doesn't make sense for branch to be optional really

[cduvall, 2013-04-23 23:55:09]

This is cool, I really like this change. lgtm

[commit-bot: I haz the power, 2013-04-24 04:20:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kalman@chromium.org/14267024/5001

[commit-bot: I haz the power, 2013-04-24 04:22:10]

Presubmit check for 14267024-5001 failed and returned exit status 1.

INFO:root:Found 27 file(s).

ERROR:root:extensions/examples/api/downloads/download_links/icon.png had empty
content
ERROR:root:extensions/examples/extensions/benchmark/jquery/jquery-ui-1.8.4.custom.min.js
had empty content
ERROR:root:extensions/examples/extensions/benchmark/jquery/jquery.flot.valuelabels.js
had empty content
ERROR:root:extensions/examples/extensions/benchmark/jquery/jquery.flot.navigate.js
had empty content
ERROR:root:extensions/examples/extensions/benchmark/jquery/jquery.flot.js had
empty content
ERROR:root:extensions/examples/extensions/benchmark/jquery/jquery.client.js had
empty content
ERROR:root:extensions/examples/apps/hello-python/oauth2/clients/__init__.py had
empty content
..ERROR:root:File system is offline, cannot read
docs/templates/public/extensions/
.
----------------------------------------------------------------------
Ran 3 tests in 59.109s

OK
Running cron...
Took 52.7798240185 seconds
Rendering 234 public files...
Took 6.31759905815 seconds
Running presubmit commit checks ...
Running /b/commit-queue/workdir/chromium/PRESUBMIT.py
Running /b/commit-queue/workdir/chromium/chrome/PRESUBMIT.py
Running /b/commit-queue/workdir/chromium/chrome/common/extensions/PRESUBMIT.py
Traceback (most recent call last):
  File "/b/commit-queue/verification/presubmit_shim.py", line 33, in <module>
    sys.exit(presubmit_support.Main(argv))
  File "/b/depot_tools/presubmit_support.py", line 1368, in Main
    rietveld_obj)
  File "/b/depot_tools/presubmit_support.py", line 1180, in DoPresubmitChecks
    results += executer.ExecPresubmitScript(presubmit_script, filename)
  File "/b/depot_tools/presubmit_support.py", line 1097, in ExecPresubmitScript
    result = eval(function_name + '(*__args)', context)
  File "<string>", line 1, in <module>
  File "<string>", line 155, in CheckChangeOnCommit
  File "<string>", line 147, in _CheckChange
NameError: global name '_CheckVersions' is not defined