host: Cleanup containers concurrently
host: Cleanup containers concurrently

Signed-off-by: Lewis Marshall <748e1641a368164906d4a0c0e3965345453dcc93@lmars.net>

supermario/flynn,justintung/flynn,whouses/flynn,pkdevbox/flynn,Brandywine2161/flynn,benbjohnson/flynn,pkdevbox/flynn,Brandywine2161/flynn,benbjohnson/flynn,schatt/flynn,arekkas/flynn,GrimDerp/flynn,TribeMedia/flynn,felixrieseberg/flynn,justintung/flynn,schatt/flynn,shads196770/flynn,rikur/flynn,ozum/flynn,shads196770/flynn,jzila/flynn,shads196770/flynn,pkdevbox/flynn,TribeMedia/flynn,schatt/flynn,supermario/flynn,pkdevbox/flynn,shads196770/flynn,schatt/flynn,clifff/flynn,Brandywine2161/flynn,mubassirhayat/flynn,Brandywine2161/flynn,ozum/flynn,lmars/flynn,rikur/flynn,rikur/flynn,benbjohnson/flynn,schatt/flynn,Brandywine2161/flynn,josephglanville/flynn,technosophos/flynn,whouses/flynn,mubassirhayat/flynn,justintung/flynn,ozum/flynn,ozum/flynn,lmars/flynn,GrimDerp/flynn,flynn/flynn,whouses/flynn,flynn/flynn,supermario/flynn,rikur/flynn,schatt/flynn,jzila/flynn,philiplb/flynn,rikur/flynn,tonicbupt/flynn,tonicbupt/flynn,pkdevbox/flynn,technosophos/flynn,tonicbupt/flynn,GrimDerp/flynn,ozum/flynn,kgrz/flynn,lmars/flynn,josephglanville/flynn,supermario/flynn,jzila/flynn,rikur/flynn,shads196770/flynn,philiplb/flynn,kgrz/flynn,tonicbupt/flynn,supermario/flynn,flynn/flynn,josephglanville/flynn,josephglanville/flynn,kgrz/flynn,lmars/flynn,TribeMedia/flynn,TribeMedia/flynn,GrimDerp/flynn,whouses/flynn,shads196770/flynn,pkdevbox/flynn,supermario/flynn,benbjohnson/flynn,josephglanville/flynn,lmars/flynn,arekkas/flynn,TribeMedia/flynn,benbjohnson/flynn,clifff/flynn,clifff/flynn,jzila/flynn,GrimDerp/flynn,arekkas/flynn,benbjohnson/flynn,philiplb/flynn,technosophos/flynn,TribeMedia/flynn,justintung/flynn,whouses/flynn,justintung/flynn,jzila/flynn,Brandywine2161/flynn,arekkas/flynn,flynn/flynn,felixrieseberg/flynn,whouses/flynn,clifff/flynn,flynn/flynn,clifff/flynn,justintung/flynn,jzila/flynn,technosophos/flynn,arekkas/flynn,felixrieseberg/flynn,kgrz/flynn,ozum/flynn,technosophos/flynn,philiplb/flynn,felixrieseberg/flynn,GrimDerp/flynn,kgrz/flynn,josephglanville/flynn,kgrz/flynn,philiplb/flynn,clifff/flynn,shutej/flynn,mubassirhayat/flynn,tonicbupt/flynn,felixrieseberg/flynn,mubassirhayat/flynn