This branch adds the ability to define a local JSON file that will hold
configuration information that the scheduler can use.
This dict will be passed into the filter and weighing functions so that
Operations can tweak the scheduler without having to bring down the scheduler
service.
Currently the polling time on the file is hardcoded at 5 minutes, but certainly
this could be made into a flag.
Next update will be to remove the host_filter and weighing_functions flags
and fix the scheduler to get these values from the config file.
Change-Id: Ia2487e933483761276058689fad84564d96a451e
db640a36b3