Jeffrey Zhang 4ab76ed9e1 Put upper limit on cmd2 in kolla-toolbox
This fixes an issue with cmd2 >= 0.9.0 requiring python3.

Change-Id: I5f88f0b0540785f8e7b7ab7c5252c6a51f314922
Closes-Bug: #1773938
2018-05-30 16:00:58 +08:00
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