Imported Translations from Transifex

Change-Id: Ie1523eac21f7222050cab5dc923810adfbb39f77
Fix typo in rootwrap files: neuton -> neutron

The l3 filters one in particular breaks /usr/local installs because
its spelt wrongly.

Change-Id: I609e3f448256cb8c9211c4d67ae48cb2ee5b6094
Return request-id in API response

Import RequestIdMiddleware from oslo which ensures to request-id
in API response. CatchErrorsMiddleware is also imported to ensure
all internal exceptions are caught outermost.
api-paste.ini is updated to use them.

KeystonAuthContext middleware is updated so that it uses
request-id generated by RequestIdMiddleware.

Add middleware to openstack.conf and import all modules
under middleware directory from oslo.

DocImpact UpgradeImpact
This patch adds new WSGI middlewares "request_id" and "catch_errors".
They needs to be added to api-paste.ini when upgrading.

Change-Id: Icf01b7de697ef50bef53212da2cf520d1ff78b88
Closes-Bug: #1239923
Merge "Fix typo in rootwrap files: neuton -> neutron"
Merge "Return request-id in API response"