cxmanage: fix references to args.user
cxmanage: fix references to args.user

when you add a long form of an argument, you can no longer reference it
by the short from in the args namespace.

SilverLiningSystems/cxmanage-test,SilverLiningSystems/cxmanage-test2,SLS-Dev/cxmanage,SLS-Dev/cxmanage,SilverLiningSystems/cxmanage-test2,Cynerva/cxmanage,Cynerva/cxmanage,SilverLiningSystems/cxmanage-test