During mongo startup different components like storage, watchdog etc are initialized. This enables different FTDC stat collection. In this ticket, FTDC stat collection of different sections will be enabled as initialization moves from one stage to another. Current implementation is for two stages (system start, and storage initialized);  it can be extended. 

This change will enable the server status readers to start stat collection before or after the storage engine initialization based on a setting chosen when the status section is built.

It is related to SERVER-87363