DRILL-6663: Fixed shutdown button
DRILL-6663: Fixed shutdown button

closes #1424
apache/drill,mapr/incubator-drill,apache/drill,Agirish/drill,Ben-Zvi/drill,apache/drill,johnnywale/drill,mapr/incubator-drill,Ben-Zvi/drill,Agirish/drill,mapr/incubator-drill,superbstreak/drill,paul-rogers/drill,johnnywale/drill,superbstreak/drill,mapr/incubator-drill,sohami/drill,paul-rogers/drill,vdiravka/drill,cchang738/drill,arina-ielchiieva/drill,vdiravka/drill,sohami/drill,paul-rogers/drill,johnnywale/drill,vvysotskyi/drill,arina-ielchiieva/drill,paul-rogers/drill,cchang738/drill,mapr/incubator-drill,kkhatua/drill,Ben-Zvi/drill,kkhatua/drill,tgrall/drill,vvysotskyi/drill,Ben-Zvi/drill,superbstreak/drill,vvysotskyi/drill,kkhatua/drill,cchang738/drill,sohami/drill,arina-ielchiieva/drill,sohami/drill,tgrall/drill,cchang738/drill,superbstreak/drill,vvysotskyi/drill,apache/drill,arina-ielchiieva/drill,tgrall/drill,johnnywale/drill,cchang738/drill,vdiravka/drill,cchang738/drill,sohami/drill,mapr/incubator-drill,Ben-Zvi/drill,vdiravka/drill,paul-rogers/drill,superbstreak/drill,kkhatua/drill,vdiravka/drill,Agirish/drill,tgrall/drill,arina-ielchiieva/drill,sohami/drill,apache/drill,apache/drill,kkhatua/drill,johnnywale/drill,paul-rogers/drill,vvysotskyi/drill,superbstreak/drill,Ben-Zvi/drill,tgrall/drill,kkhatua/drill,Agirish/drill,Agirish/drill,arina-ielchiieva/drill,vvysotskyi/drill,Agirish/drill