Add read-only support and annotations
Add read-only support and annotations

The update to the gateway and faas-swarm add read-only containers
and the ability to use annotations in the function schema.

faas-cli 0.6.17 is required.

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

openfaas/faas,rgee0/faas,rgee0/faas,openfaas/faas,rgee0/faas,rgee0/faas,rgee0/faas,rgee0/faas,alexellis/faas,openfaas/faas,rgee0/faas,alexellis/faas,rgee0/faas,alexellis/faas,alexellis/faas,rgee0/faas,rgee0/faas,alexellis/faas,alexellis/faas,alexellis/faas,alexellis/faas,alexellis/faas