P2P replace DNS panic with map_err (#3383)
P2P replace DNS panic with map_err (#3383)

Replace panic on DNS resolution error with map_err to bubble
up error to the caller

Co-authored-by: Nym Seddon <1e12f322c4024cf439e63ccba44909e126f4880e@shh.xyz>
yeastplume/grin,yeastplume/grin