BUG/MINOR: stream: Reset stream final state and si error type on L7 retry

BUG/MINOR: stream: Reset stream final state and si error type on L7 retry

Thanks to a previous fix, the stream error mask is now cleared on L7
retry. But the stream final state (SF_FINST_*) and the stream-interface
error type must also be reset to properly restart a new connection and be
sure to not inherit errors from the previous connection attempt.

In addition, SF_ADDR_SET flag is not systematically removed.
stream_choose_redispatch() already takes care to unset it if necessary. When
the connection is not redispatch, the server address can be preserved.

This patch must be backported as far as 2.0.