Docserver: Fix API refresh task names

Docserver: Fix API refresh task names

So these tasks have been queueing with different path names than
those used by the template processor. The latter uses "Unix name"
equivalents of the API features, while the former was not.

For example, "apps/appviewTag" has been caching as such but the
template looks for "apps/appview_tag". It's unclear when this
incongruity appeared but it explains several "my-docs-arent-updating"
bugs that have appeared in the past several weeks.

This changes the refresh servlet to queue API refresh tasks using
API features in unix_name form, resolving the incongruity.

BUG=471019
TBR=kalman@chromium.org

Committed: https://crrev.com/7c5cf152973d5f5383d4a8a6ce9fc6ebb628811b
Cr-Commit-Position: refs/heads/master@{#322496}

[Ken Rockot(use gerrit already), 2015-03-26 22:47:50]

Going to push this out since it works and it's live anyway.

[Ken Rockot(use gerrit already), 2015-03-26 22:47:55]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2015-03-26 22:48:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1038993002/1

[commit-bot: I haz the power, 2015-03-26 23:31:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-26 23:33:06]

Patchset 1 (id:??) landed as
https://crrev.com/7c5cf152973d5f5383d4a8a6ce9fc6ebb628811b
Cr-Commit-Position: refs/heads/master@{#322496}