Added cmd description when displaying cmd usage

src/client_cli/login.go

src/client_cli/templateCreate.go

src/client_cli/templateDel.go

src/client_cli/templateList.go

src/client_cli/userAdd.go

src/client_cli/userDel.go

src/client_cli/userList.go

src/client_cli/userSetCaps.go

src/client_cli/userUpdatePwd.go

src/client_cli/userWhoami.go

src/client_cli/vmAttach.go

src/client_cli/vmCreate.go

src/client_cli/vmDel.go

src/client_cli/vmDelAccess.go

src/client_cli/vmEdit.go

src/client_cli/vmList.go

src/client_cli/vmListAttach.go

src/client_cli/vmListDel.go

src/client_cli/vmListEdit.go

src/client_cli/vmListEditAccess.go