How to choose proper branch of rally

I am working on OpenStack test with rally, we know that rally depends on the OpenStack clients, in my case, these clients are based on Juno, such as:
# keystone --version
0.11.1
# nova --version
2.20.0
# neutron --version
2.3.9

How can I get the proper rally branch? I could compare the requirement one by one,
Tag 0.02
...
python-glanceclient>=0.15.0
python-keystoneclient>=1.1.0
python-novaclient>=2.18.0,!=2.21.0
python-neutronclient>=2.3.11,<3
python-cinderclient>=1.1.0
python-heatclient>=0.3.0
...

I wonder whether this is the only way?