Add Secret to structs

Add Secret struct

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

Port models from openfaas/faas gateway

Port models from gateway

This patch moves types from the requests package of the gateway
into faas-provider, so that providers will no longer have to
vendor the gateway package.

Ref: https://github.com/openfaas/faas/issues/565

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

Update logging interface

Fix import of httputils and add travis CI

**What**
- Fix a broken rename in the proxy code, it was referenceing `httputils`
instead of the correct `httputil`
- Add a travis config to help ensure that the project is compilable

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

Define the logging interface

Changelog:

• Feature: Define the logging interface #15 via @LucasRoesler

Allows providers to provide logs via a stream

Allow override for secret name paths

Basic auth username/password can be read from any
path required.

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

Rename health handler

Changelog:

• Rename health handler #16 @ewilde

Add /system/secrets

Changelog:

• adds /system/secrets via 220324e @acornies

Break out function proxy code

Changelog:

• Break out function proxy code #9 by @LucasRoesler

Allow basic auth decoration

Protected/system endpoints can now be decorated with basic auth

// FaaSConfig set config for HTTP handlers
type FaaSConfig struct {
	TCPPort         *int
	ReadTimeout     time.Duration
	WriteTimeout    time.Duration
	EnableHealth    bool
	EnableBasicAuth bool
	SecretMountPath string
}

Set EnableBasicAuth to true and populate the value for SecretMountPath.

Include basic-auth packages

Moves out middle-ware and loading code from gateway in openfaas/faas.