Requirement versions were set in the first place to limit the
buginess. However, after some time it appears that it made more
harm than good, as discussed in:
https://review.openstack.org/#/c/388003/
In this commit we remove the versions for the requirements, except
for the following:
- Nova
- synergy-service
In the future, if a specific dependency version is causing some issue
we should reintroduce the version for this dependency to block the
unstable version.
Sem-Ver: bugfix
Change-Id: If65e670a18a495a5c3f5c08c80b6b1d3abec5747
c86966c326