Remove m_keepConn entirely from FastCGI

Summary: A faulty assumption (that onIngress would only be called at the start of
a connection) was causing assertion failures for very large requests. Since
we don't currently support KEEP_CONN anyway just kill the flag.

Closes #3296

Reviewed By: @JoelMarcey

Differential Revision: D1559698
Print(Str|Int|Bool) can throw

Reviewed By: @jdelong, @swtaarrs

Differential Revision: D1603435
Remove QuickLZ from OSS builds

Summary: Removes QuickLZ from from the zlib extension.

This revision has been cloned to https://reviews.facebook.net/D25167.
CAUTION! Diff LoC changed when mirrored (from  347 to 160) - is there significant code in this diff that won't get reviewed? If so, consider breaking this diff up into smaller pieces that do not span public and private directories.
Please use the other revision for review.
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Reviewed By: @ptarjan

Differential Revision: D1624996