Fix call to member add command.
Fix call to member add command.


Former-commit-id: e18c2755b73f991e2199ee7d35f778871c9ce228
alexhersh/libcalico,projectcalico/libnetwork-plugin,insequent/libcalico,TrimBiggs/libnetwork-plugin,L-MA/libcalico,tomdee/libcalico,caseydavenport/libcalico,TrimBiggs/libcalico,tomdee/libnetwork-plugin,robbrockbank/libcalico,TrimBiggs/libnetwork-plugin,Symmetric/libcalico,plwhite/libcalico,djosborne/libcalico,projectcalico/libcalico