Update Version11 Spec for host_services

Update the Version11 spec to include tests for host_services method.
Add host_services Method for Version11

Update the Version11 class to include a host_services method.
Add Spec for Server monitored_services_for Method

Update the Server spec to include a test for the monitored_services_for
method.
Add monitored_services_for Method for Server

Update the Server class to include a monitored_services_for method.