There is no reason to impose a short deadline for packaging
or lifecycle management projects that want to trail the
release. Let's relax the constraints and accept that
cycle-trailing releases can happen up to 3 months after the
main components synchronized release.
Additionally, the idea behind the membership check at
milestone-2 is to protect packagers against late additions,
not to prevent late-added packaging systems from doing a
release. The new rules should also apply to Queens, so that
OpenStack-Helm and LOCI can actually do a Queens packaging
release, despite having been added post milestone-2.
Change-Id: If997e6053af6e74bf6ce8755313346effca6b4e5
c6f2124ae5