build-osv-release: Switch to empty image

Currently, "mgmt.httpserver" pulls the entire OpenJDK which is not what
we want for osv-base image which is supposed to be around 10 MB.

Switch to "empty" image configuration until the problem is resolved.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

scripts/build-osv-release

@@ -4,7 +4,7 @@ set -e
 
 build=./scripts/build-capstan-img
 
-$build cloudius/osv-base      mgmt.httpserver           "OSv base image for developers"
+$build cloudius/osv-base      empty                     "OSv base image for developers"
 $build cloudius/osv           default                   "OSv with shell for users"
 $build cloudius/osv-cassandra cassandra,mgmt.httpserver "Apache Cassandra/OSv"
 $build cloudius/osv-tomcat    tomcat,mgmt.httpserver    "Apache Tomcat/OSv"