Control API: in memory config dump.

Control API: in memory config dump.

The /control/config endpoint returns the currently parsed and running
configuration on GET request.

Example:

$ curl 127.0.0.1:1234/1/control/config | jq
[
  {
    "name": "/path/to/nginx.conf",
    "content": "..."
  },
  {
    "name": "/path/to/included.conf",
    "content": "..."
  }
]

Co-authored-by: Pavel Pautov <p.pautov@f5.com>