Expose scale-function endpoint

- exposes scale-function endpoint for use with faas-idler, this
is protected by auth when enabled.

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Bump gateway version to 0.8.7

This commit bumps gateway version to 0.8.7 in docker-compose.yml and
also adds `scale_from_zero` environment variable to the gateway.

Fixes: openfaas#780

Signed-off-by: Vivek Singh <[email protected]>

Refactor scaling to use existing code

Existing code has been used for scaling up and querying replicas.
This meant the new code was deleted and there is less duplication
now.

The cache store a whole query response rather than just the
available replica count and the tests were updated. This has been
tested with Docker swarm and the image:
 openfaas/gateway:scale-17-07-2018

This feature now needs the env-var of scale_from_zero to be enabled
in order to turn on the scaling behaviour.

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Move CI to use openfaas/* ns

This was a miss by refactoring work and is causing a CI failure

https://travis-ci.org/openfaas/faas/builds/404409816

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Push gateway image to both Quay.io and Docker Hub

With this change gateway will be pushed to Quay.io on release
as a backup

Signed-off-by: Ivana Yovcheva (VMware) <[email protected]>

Changes from pull request feedback

1. Use httptest.ResponseRecorder instead of custom implementation
StringResponseWriter.

2. Remove verbose log line in infohandler

Signed-off-by: Edward Wilde <[email protected]>

Move from functions ns to openfaas for Hub

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Read secrets from variable path

This change enables secrets to be read from any mount on disk
rather than hard-coding a certain location which suits Swarm or
K8s. The default value if not specified will look in the Swarm
location of /run/secrets/

README.md (docs) updated and set to off by default.

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Move to 0.8.1 of gateway

Makes health and info endpoints available, see release notes.

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Add message for when JavaScript is disabled

 - Added padding to the "You need JavaScript page"
 - Added padding to the "You need JavaScript page" - Added info about the CLI tthe "You need JavaScript" page
 - Added a message for people who don't have JavaScript enabled

Signed-off-by: Rillian Grant <[email protected]>