dccp: send Confirm options only once
If a connection is in the OPEN state, remove feature negotiation Confirm options from the list of options after sending them once; as such options are NOT supposed to be retransmitted and are ONLY supposed to be sent in response to a Change option (RFC 4340 6.2). Signed-off-by: NSamuel Jero <sj323707@ohio.edu> Acked-by: NGerrit Renker <gerrit@erg.abdn.ac.uk>
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