java-openliberty: fix missing continuation on echo message (#797)

Co-authored-by: Kamran Shamsi <45264227+Kamran64@users.noreply.github.com>

incubator/java-openliberty/image/project/Dockerfile

@@ -45,7 +45,7 @@ COPY --chown=java_user:java_group ./user-app /project/user-app
 #  also liberty:create copies config from src->target
 #  also remove quick-start-security.xml since it's convenient for local dev mode but should not be in the production image.
 RUN cd /project/user-app && \
-    echo "QUICK START SECURITY IS NOT SECURE FOR PRODUCTION ENVIRONMENTS. IT IS BEING REMOVED" \
+    echo "QUICK START SECURITY IS NOT SECURE FOR PRODUCTION ENVIRONMENTS. IT IS BEING REMOVED" && \
     rm -f src/main/liberty/config/configDropins/defaults/quick-start-security.xml && \
     mvn -Pappsody-build -B liberty:create package