Move to oslo.middlware request_id module

The oslo-incubator request_id module has been deprecated and
removed for kilo, replaced by the request_id from oslo.middleware.

Note that we need to leave the oslo-incubator request_id shim in place
until after Kilo ships, so operators get fair warning about the
backwards-incompatible paste.ini change.

Change-Id: Iedbfede6d57312f565cf4b1ccb71a8418fad8620
Partial-Bug: #1380629
Fix translating error in unittests

Change-Id: I1d64143a4bf8ddcf2ebe4a0bda049e962f3912e5
Closes-Bug: #1384669
Convert value type in alarm matching_metadata

Commit I0667db868c6f827867a5a20e4a3fa22fcad1a6a1 added query
property in OS::Ceilometer::Alarm resource and add
matching_metadata elements to query list. Value type in
query elements need to be a string, but value type in
matching_metadata elements can not be a string. So we need to
convert value type to string, when we add element to query list.

Change-Id: Ie6af0bfca4f3e089e0ee3e226804a2d365f6d6ae
Closes-bug: #1380168
Merge "Convert value type in alarm matching_metadata"
Merge "Fix translating error in unittests"
Merge "Move to oslo.middlware request_id module"