Refactor secrets handler logic into sub-handlers

**What**
- Create independent handler methods for each support http method

Signed-off-by: Lucas Roesler <[email protected]>

Bump golang to 1.10.x and alpine to 3.8

**What**
- Bump the base docker image to golang:1.10
- Bump the alpine version to 3.8

Signed-off-by: Lucas Roesler <[email protected]>

Update status code for CRUD APIs

This commit updates the status code from 200 to 202 for create, update
or delete APIs.

Fixes: openfaas#220

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

Expand verbs allowed for proxying

- Adds additional verbs as per g/w and watchdog

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

Chart version bumped to 1.2.3

- 1.2.3 version moves the gateway to 0.9.1

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

Add annotation support

Store stack.yml annotation meta data in deployment, pod, service and
replicaset

Relates to openfaas/faas#682

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

Correct error in CI

The "latest-dev" tag was specified when it did not exist.

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

Push image to both Quay.io and Docker Hub

With this change faas-netesd will be pushed to Quay.io
on release as a backup

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

Bump gw/faas-netes + fix label update

Now that we have a label selector which is distinct from our own
labels we have to update the deployment labels in the update code.

Bumps GW to 0.8.2 (basic auth support) and faas-netesd to latest
for label enhancements. Tested on GKE 1.9.6.

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

Move label query to deployment.labels

When querying labels we were returning the selector labels instead
of the deployment labels. This change corrects the regression
which was introduced in 0.5.3.

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