pinkerton: Update graphdriver.GetDriver signature
pinkerton: Update graphdriver.GetDriver signature

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

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