Adds a new 'hanlon_subnets' parameter to the Hanlon server configuration
(and uses that parameter to determine if a RESTful request submitted by a
user against the Hanlon server is from the Hanlon subnet).
Merge pull request #294 from tjmcs/tb/add-subnet-def-to-config

Fixes #293 (Users should be able to specify values for the Hanlon subnet)
Modifies test for request from server to include 'hanlon_server' IP address
Merge pull request #296 from tjmcs/tb/fix-request-from-hanlon-server

Fixes #295 (Request from server test fails for some configurations)