Adding wanghao candidacy for Zaqar

Change-Id: Ibaec3ee105737c1ba77751450042f8eb9f46668b

candidates/stein/Zaqar/sxmatch1986@gmail.com

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+Hi all,
+
+It's very pleasure for me that being a Zaqar developer from 2016, and also
+being a PTL for Rocky cycle. Today, I'd like to continue serving Zaqar better
+as a PTL, if you let me.
+
+We did a great job in Rocky. Supported the different format of client id to be
+more suitable for more use cases. We also introduced the function to query
+queues filtered by name and metadata in mongodb backend.
+For Stein release, I want to finish the list of job below.
+
+1. Refactoring
+   We want to remove useless pool group totally in Stein and make the model of
+   pool and flavor more clear.
+
+2. Scalability
+   We will continue our work to improve Zaqar's performance under the different
+   cases of load increasing:
+   1) number of publishers
+   2) number of subscribers
+   3) rate of messages published or consumed
+   4) number of messages
+   5) number of queues
+   6) size of messages
+
+3. Usability
+   We still have some works that inherit from Rocky. Those tasks contains very
+   useful features:
+   1) Introduce an new resource for queue's metadata
+   2) Introduce topic resource for notification
+   3) Delete message with claim ID
+   4) Send Email subscription by Zaqar
+
+It's a fantastic experience working with this amazing team and I would be
+pleased to serve as PTL for next cycle and I'd appreciate your vote.
+
+Thanks for your consideration!