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: Clement Verna <cverna@tutanota.com>

Dockerfile

@@ -11,7 +11,6 @@ FROM registry.fedoraproject.org/f29/s2i-core:latest
 ENV HTTPD_VERSION=2.4 \
     NAME=httpd \
     VERSION=$HTTPD_VERSION \
-    RELEASE=1 \
     ARCH=x86_64
 
 ENV SUMMARY="Platform for running Apache httpd $HTTPD_VERSION or building httpd-based application" \
@@ -30,7 +29,6 @@ LABEL summary="$SUMMARY" \
       com.redhat.component="$NAME" \
       name="$FGC/$NAME" \
       version="2.4" \
-      release="$RELEASE.$DISTTAG" \
       architecture="$ARCH" \
       usage="s2i build https://github.com/sclorg/httpd-container.git --context-dir=examples/sample-test-app/ $FGC/$NAME sample-server" \
       maintainer="SoftwareCollections.org <sclorg@redhat.com>"