Nova OSP12 - fix functional tests.
Nova OSP12 - fix functional tests.

Update gabbi to allow placement api test pass and
skip one test due to outdated version of sqlite3.

This change updates gabbi to version 1.35.1 to allow one
functional test to pass: test_request

It also applies work around for one test failing, which requires
newer version of sqlite3.

Change-Id: I281d533f3647d948567bb3cf2bdd8df3bbffe3d8

redhat-openstack/octario,redhat-openstack/octario