Fixes #518 sending auth secrets on invoke
Fixes #518 sending auth secrets on invoke

Auth secrets were being sent since auth was introduced in the
CLI 10 months ago. This is problematic for two reasons:
1) there is no auth enabled on the function endpoints, 2) this
could expose the system authentication secrets to functions
which is undesired.

Signed-off-by: Alex Ellis (VMware) <5f7133baa0f5c7ca63ff11e11f2e2b0d2cf077c8@gmail.com>

itscaro/faas-cli,itscaro/faas-cli,itscaro/faas-cli