SERVER-11144 Chaining interface for option registration
SERVER-11144 Do not call _exit directly in any options handling functions
SERVER-11144 Create unit tests for registration in all option files
SERVER-11144 Use new chaining interface in options
SERVER-11144 Remove old registration interface
SERVER-11144 Add attribute to affect what sources an option can have
SERVER-11144 Add positional options to chaining interface
SERVER-11144 Fix logic error in mongofiles option registration