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engine: fix sending raft state during META_JOIN

Engine (and previously relay) didn't send raft state during META_JOIN
stage, as it was marked with GROUP_LOCAL id and skipped by the stream
function. This may cause split brain as replica doesn't have any info
about term before the time, it gets it in the beginning of the
SUBSCRIBE (see sent_raft_term).

Let's use GROUP_DEFAULT id, so that raft request is properly sent during
META_JOIN stage. We must nullify state and vclock of the raft request,
since we don't need them during raft recovery and because old replicas
assert, that they are not set, and we don't want to break the upgrade
process.

Closes #10089

NO_DOC=bugfix

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