Enable client hello parsing by default.
Enable client hello parsing by default.

Summary: Client hello parsing needs to be on for proxygen_ssl logging and for
sha1/2 cert switching to work. Previously if the option wasn't set in config,
it defaulted to off, which was the case for a couple vips.

Reviewed By: siyengar

Differential Revision: D2462167

fb-gh-sync-id: d669583723fb5f8332332168a3b360449219fc49

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