Since we've already merged the spec for adding 'project_id' to
group response, we're adding the spec 'project_id' response of group
snapshots under the same microversion to avoid version bump for
similar type of features.
Change-Id: I99e760c29080b47207eef320cc16add695e91e37
Implements: blueprint add-project-id-to-group-groupsnapshot-response