Commits on May 28, 2019

1. tls: group chunks into TLS segments …

   TLSWrap::DoWrite() now concatenates data chunks and makes a single
   call to SSL_write(). Grouping data into a single segment:
   
   - reduces network overhead: by factors of even 2 or 3 in usages
     like `http2` or `form-data`
   
   - improves security: segment lengths can reveal lots of info, i.e.
     with `form-data`, how many fields are sent and the approximate length
     of every individual field and its headers
   
   - reduces encryption overhead: a quick benchmark showed a ~30% CPU time
     decrease for an extreme case, see
     nodejs#27573 (comment)
   
   Fixes: nodejs#27573

   

   mildsunrise committed May 28, 2019
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