Add concurrent logging tests
Add concurrent logging tests

Should work for PR #1366 as well.

shamangeorge/beets,sampsyo/beets,marcuskrahl/beets,MyTunesFreeMusic/privacy-policy,mosesfistos1/beetbox,madmouser1/beets,mosesfistos1/beetbox,marcuskrahl/beets,PierreRust/beets,shanemikel/beets,shanemikel/beets,Andypsamp/CODjunit,Kraymer/beets,lengtche/beets,sadatay/beets,YetAnotherNerd/beets,sadatay/beets,SusannaMaria/beets,madmouser1/beets,marcuskrahl/beets,jcoady9/beets,asteven/beets,ruippeixotog/beets,imsparsh/beets,tima/beets,Andypsamp/CODfinalJUNIT,artemutin/beets,Andypsamp/CODfinalJUNIT,dfc/beets,randybias/beets,xsteadfastx/beets,Andypsamp/CODjunit,jackwilsdon/beets,mosesfistos1/beetbox,kelvinhammond/beets,mathstuf/beets,diego-plan9/beets,shamangeorge/beets,parapente/beets,swt30/beets,swt30/beets,sampsyo/beets,kelvinhammond/beets,lengtche/beets,lightwang1/beets,Dishwishy/beets,m-urban/beets,kelvinhammond/beets,artemutin/beets,jmwatte/beets,madmouser1/beets,MyTunesFreeMusic/privacy-policy,beetbox/beets,imsparsh/beets,untitaker/beets,pkess/beets,mathstuf/beets,Andypsamp/CODfinalJUNIT,gabrielaraujof/beets,xsteadfastx/beets,ttsda/beets,Andypsamp/CODjunit,Andypsamp/CODfinalJUNIT,untitaker/beets,ibmibmibm/beets,artemutin/beets,YetAnotherNerd/beets,tima/beets,arabenjamin/beets,jcoady9/beets,moodboom/beets,Freso/beets,PierreRust/beets,diego-plan9/beets,kareemallen/beets,ibmibmibm/beets,sadatay/beets,m-urban/beets,randybias/beets,sampsyo/beets,Andypsamp/CODfinalJUNIT,jackwilsdon/beets,jmwatte/beets,lengtche/beets,gabrielaraujof/beets,jcoady9/beets,imsparsh/beets,kareemallen/beets,asteven/beets,lightwang1/beets,marcuskrahl/beets,imsparsh/beets,moodboom/beets,randybias/beets,moodboom/beets,beetbox/beets,tima/beets,ruippeixotog/beets,Freso/beets,jmwatte/beets,kareemallen/beets,mathstuf/beets,kelvinhammond/beets,PierreRust/beets,Freso/beets,multikatt/beets,Dishwishy/beets,parapente/beets,gabrielaraujof/beets,mosesfistos1/beetbox,lengtche/beets,pkess/beets,shanemikel/beets,mried/beets,LordSputnik/beets,SusannaMaria/beets,Dishwishy/beets,dfc/beets,diego-plan9/beets,jmwatte/beets,xsteadfastx/beets,xsteadfastx/beets,lightwang1/beets,Freso/beets,drm00/beets,tima/beets,beetbox/beets,madmouser1/beets,m-urban/beets,untitaker/beets,sampsyo/beets,ttsda/beets,MyTunesFreeMusic/privacy-policy,Dishwishy/beets,diego-plan9/beets,jcoady9/beets,mried/beets,randybias/beets,MyTunesFreeMusic/privacy-policy,shamangeorge/beets,SusannaMaria/beets,arabenjamin/beets,ruippeixotog/beets,Kraymer/beets,shanemikel/beets,parapente/beets,ibmibmibm/beets,Kraymer/beets,LordSputnik/beets,moodboom/beets,ruippeixotog/beets,beetbox/beets,gabrielaraujof/beets,drm00/beets,ttsda/beets,YetAnotherNerd/beets,parapente/beets,multikatt/beets,lightwang1/beets,pkess/beets,dfc/beets,dfc/beets,sadatay/beets,kareemallen/beets,ttsda/beets,mried/beets,SusannaMaria/beets,mried/beets,drm00/beets,m-urban/beets,asteven/beets,mathstuf/beets,arabenjamin/beets,shamangeorge/beets,ibmibmibm/beets,Andypsamp/CODjunit,multikatt/beets,LordSputnik/beets,jackwilsdon/beets,Andypsamp/CODjunit,YetAnotherNerd/beets,jackwilsdon/beets,multikatt/beets,pkess/beets,artemutin/beets,arabenjamin/beets,swt30/beets,Kraymer/beets,asteven/beets,swt30/beets,LordSputnik/beets,PierreRust/beets,untitaker/beets,drm00/beets