Consolidate python dependencies.
Consolidate python dependencies.


Former-commit-id: b863402cad248d9d6daa2d285c06610d991c081f
projectcalico/libnetwork-plugin,alexhersh/libcalico,robbrockbank/libcalico,tomdee/libcalico,TrimBiggs/libnetwork-plugin,TrimBiggs/libnetwork-plugin,L-MA/libcalico,TrimBiggs/libcalico,projectcalico/libcalico,djosborne/libcalico,Symmetric/libcalico,insequent/libcalico,caseydavenport/libcalico,plwhite/libcalico,tomdee/libnetwork-plugin