markj 395e29f3c0 Make zlib encoding messages idempotent.
Otherwise duplicate messages can trigger a reinitialization of the
compression stream while the update thread is running.  Also ensure
that the stream is initialized before the update thread may attempt
to use it.

PR:		238333
Reviewed by:	cem, rgrimes
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D20673
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