Log Message:
mail/dovecot2: update to 2.3.6

Update dovecot2 and dovecot-{gssapi,ldap,mysql,pgsql,sqlite} to 2.3.6.

v2.3.6 2019-04-30  Aki Tuomi <aki.tuomi@open-xchange.com>

	* CVE-2019-11494: Submission-login crashed with signal 11 due to null
	  pointer access when authentication was aborted by disconnecting.
	* CVE-2019-11499: Submission-login crashed when authentication was
	  started over TLS secured channel and invalid authentication message
	  was sent.
	* auth: Support password grant with passdb oauth2.
	+ Use system default CAs for outbound TLS connections.
	+ Simplify array handling with new helper macros.
	+ fts_solr: Enable configuring batch_size and soft_commit features.
	- lmtp/submission: Fixed various bugs in XCLIENT handling, including a
	  hang when XCLIENT commands were sent infinitely to the remote server.
	- lmtp/submission: Forwarded multi-line replies were erroneously sent
	  as two replies to the client.
	- lib-smtp: client: Message was not guaranteed to contain CRLF
	  consistently when CHUNKING was used.
	- fts_solr: Plugin was no longer compatible with Solr 7.
	- Make it possible to disable certificate checking without
	  setting ssl_client_ca_* settings.
	- pop3c: SSL support was broken.
	- mysql: Closing connection twice lead to crash on some systems.
	- auth: Multiple oauth2 passdbs crashed auth process on deinit.
	- HTTP client connection errors infrequently triggered a segmentation
	  fault when the connection was idle and not used for a particular
	  client instance.