Introduce a new docker for be plugins

Introduce a new docker image containing the etsi plugin and potentially others + simplify the process to build backend image + cleaning of unused files

Issue-ID: SDC-3289
Signed-off-by: sebdet <sebastien.determe@intl.att.com>
Change-Id: I82c770b391d169bef3bcc5f5af66e2a24dffb1b4
Signed-off-by: sebdet <sebastien.determe@intl.att.com>
diff --git a/catalog-fe/pom.xml b/catalog-fe/pom.xml
index be4b065..057df35 100644
--- a/catalog-fe/pom.xml
+++ b/catalog-fe/pom.xml
@@ -524,7 +524,7 @@
             <groupId>io.fabric8</groupId>
             <artifactId>docker-maven-plugin</artifactId>
             <configuration>
-              <apiVersion>1.23</apiVersion>
+              <apiVersion>${docker.api.version}</apiVersion>
               <registry>nexus3.onap.org:10001</registry>
               <authConfig>
                 <pull>