BaseScheme implementation

1. Add BaseScheme which holds managment struct and subschemes as well as the main scheme
2. All places where 'service-monitor_' was prefixed to a name should now be shortened to whatever came after the underscore. (init.rc, command line)
3. To read stats from gtrand now open the scheme path and dup with buffer set to name of the desired stat. RFC changes pending in branch
4. Testing and use examples are also in source/service-monitor/main.rs/test_service_data()