Tests: Fix versions view
Tests: Fix versions view

The test_build_versions test from the API views version tests
accidentally modifies the file's FAKE_VERSIONS global constant, which
may make other tests fail when run afferwards (eg: test_build_links).

This patch fixes this issue using a deepcopy to ensure that the global
constant is not modified.

Change-Id: I7b7ffa233cd838836fd1423de9442c6adb974dbb

mahak/cinder,mahak/cinder,openstack/cinder,openstack/cinder