Revert dgbuilder OS change

Reverted dgbuilder to ubuntu - start up script fails in alpine
due to missing packages.

Change-Id: I02a9d82d0c3dfc6b021951d2b1765cbdf720378d
Issue-ID: INT-1005
Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>
diff --git a/dgbuilder-docker/src/main/docker/Dockerfile b/dgbuilder-docker/src/main/docker/Dockerfile
index 6c238af..c1fd8db 100644
--- a/dgbuilder-docker/src/main/docker/Dockerfile
+++ b/dgbuilder-docker/src/main/docker/Dockerfile
@@ -1,5 +1,5 @@
 # Base ubuntu with added packages needed for open ecomp
-FROM onap/ccsdk-alpine-image:${project.docker.latestfulltag.version}
+FROM onap/ccsdk-ubuntu-image:${project.docker.latestfulltag.version}
 MAINTAINER CCSDK  Team (onap-discuss@lists.onap.org)
 
 # Create non-root user