add DRAFT socket options for libzmq 4.3.2-4

[mschubert]

This is to add the missing DRAFT socket options from the last libzmq releases

• 4.3.2: ZMQ_XPUB_MANUAL_LAST_VALUE, ZMQ_SOCKS_USERNAME, ZMQ_SOCKS_PASSWORD
• 4.3.3: ZMQ_RECONNECT_STOP, ZMQ_HELLO_MSG, ZMQ_DISCONNECT_MSG (ZMQ_ONLY_FIRST_SUBSCRIBE already present)
• 4.3.4: ZMQ_PRIORITY

[coveralls]

Pull Request Test Coverage Report for Build 5115656461

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.0%) to 86.251%

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Totals
Change from base Build 3259809024:	-0.0%
Covered Lines:	803
Relevant Lines:	931

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💛 - Coveralls

[gummif]

Thanks