Vendor the 0.9.0 faas-provider version

Vendoring the change which renames Health to HealthHandler to
faas-netes for the healthz endpoint

Signed-off-by: Martin Dekov <[email protected]>

Add new owners

Add unit test for makeProbes

Added exec and httpProbe test-cases.

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

Implement serviceAccount for functions

This change adds custom serviceAccount support for faas-netes
as per the equivalent change in the Operator:

openfaas/openfaas-operator#77

The deploy and update handlers are updated to read and
set the serviceAccountName from the annotation:
"com.openfaas.serviceaccount". When the annotation is empty
then the default service account is set when the podSpec
is updated.

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

Updates based on PR feedback:

- move logging back to caller
- return both http status code and k8s reason
- add tests for default and conflict reasons

Signed-off-by: Andrew Cornies <[email protected]>

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]>