Save tracker list when fetching metadata over ut_metadata
Save tracker list when fetching metadata over ut_metadata

Fixes https://github.com/feross/instant.io/issues/56

sideffect0/webtorrent,webtorrent/webtorrent,ngjermundshaug/webtorrent,beni55/webtorrent,akiva/webtorrent,rozifus/webtorrent,MiracleBlue/webtorrent,serafinfernandez/webtorrent,loon3/webtorrent,rom1504/webtorrent,ericwooley/webtorrent,solderzzc/webtorrent,whitef0x0/webtorrent,FabianFrancoRoldan/webtorrent,ngjermundshaug/webtorrent,LinusU/webtorrent,madmarks/webtorrent,fisch0920/webtorrent,Stiveknx/webtorrent,lucamaraschi/webtorrent,gillesdemey/webtorrent,beni55/webtorrent,arestov/webtorrent,Stiveknx/webtorrent,fisch0920/webtorrent,LinusU/webtorrent,lucamaraschi/webtorrent,dan-hill/webtorrent,MiracleBlue/webtorrent,FabianFrancoRoldan/webtorrent,yciabaud/webtorrent,rozifus/webtorrent,nicola/webtorrent,solderzzc/webtorrent,adriagalin/webtorrent,ericwooley/webtorrent,feross/webtorrent,yciabaud/webtorrent,sideffect0/webtorrent,akiva/webtorrent,serafinfernandez/webtorrent,nicola/webtorrent,adriagalin/webtorrent,dan-hill/webtorrent,joshterrill/webtorrent,gillesdemey/webtorrent,karissa/webtorrent,loon3/webtorrent,webtorrent/webtorrent,karissa/webtorrent,jamesliu96/webtorrent,whitef0x0/webtorrent,joshterrill/webtorrent,madmarks/webtorrent,feross/webtorrent,jamesliu96/webtorrent