JobRequirements needs to include std::set.

Change-Id: Ib85fe9e41158d09e015e57a720e8d3157b0cd964
Merge branch 'missing_includes'

Change-Id: If5fe34eeea3ca5c84b902e6a65bea3cbb2aa73c9
Allow derived servers the ability to check if a server is still brokering.

Change-Id: Ia34d958a4f35632f859bddbc6e375eba2f060a74