fix: bump minimum wire version to 7 and handle ismaster requests #207
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These calls are used by some MongoDB drivers, like mongodb-java-driver
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Wire version
6uses theOP_REPLYand related deprecated legacy messages:https://www.mongodb.com/docs/manual/legacy-opcodes/
PoloDB does not support these messages, so it doesn't make sense for us to advertise wire version 6 compatibility. Wire version 7 adds support for
OP_MSGmessages that PoloDB uses.Also extend the
HelloHandlerto handleismasterrequests, often used by themongoshtool.