Add support for HTTP checks

[gavinheavyside]

Newer versions of Consul support built-in HTTP+interval checks (https://consul.io/docs/agent/checks.html). This adds support for http as an alternative to script in the service_def LWRP so we can do e.g.

consul_service_def "service" do
  check(
    id: "service",
    name: "service on port 80",
    http: "http://localhost:80/",
    interval: "10s",
    timeout: "1s"
  )
  notifies :reload, "service[consul]"
end

[coveralls]

Coverage remained the same at 100.0% when pulling 7f44766 on mydrive:http-checks into 60e3072 on johnbellone:master.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.