pkg/cluster: Use io.Closer instead of anonymous interface
pkg/cluster: Use io.Closer instead of anonymous interface

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com> (github: titanous)

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