Drop Release label in favor of OSBS release_bump plugin

OSBS can automatically bump the release number, for that
we just need to drop the label from the Dockerfile

See https://pagure.io/ContainerSIG/container-sig/issue/1

Signed-off-by: Bhavin Gandhi <bhavin7392@gmail.com>

Dockerfile

@@ -3,11 +3,10 @@ MAINTAINER "Jason Brooks" <jbrooks@redhat.com>
 
 ENV container=docker
 
-ENV NAME=kubernetes-controller-manager VERSION=0 RELEASE=0 ARCH=x86_64
+ENV NAME=kubernetes-controller-manager VERSION=0 ARCH=x86_64
 LABEL BZComponent="$NAME" \
         name="$FGC/$NAME" \
         version="$VERSION" \
-        release="$RELEASE.$DISTTAG" \
         architecture="$ARCH" \
         atomic.type='system'