Remove unnecessary fields from SSLStats
Remove unnecessary fields from SSLStats

Summary: Remove some unused fields from wangle::SSLStats

Reviewed By: knekritz

Differential Revision: D3095449

fb-gh-sync-id: f4215a1c5d0ae51216adc86965364b6572104a72
fbshipit-source-id: f4215a1c5d0ae51216adc86965364b6572104a72

Dalzhim/wangle,facebook/wangle,facebook/wangle,Dalzhim/wangle,facebook/wangle