Inherit from gerrit-base in gerrit-init

The gerrit-init image was inheriting from the gerrit-slave image. This
was actually not needed anymore. This change let's the gerrit-init image
inherit from the gerrit-base image instead.

Change-Id: If7d608507c2cea75c236fcb0b109a531855254ca

container-images/gerrit-init/Dockerfile

diff --git a/container-images/gerrit-init/Dockerfile b/container-images/gerrit-init/Dockerfile
index 7202a25..fd34dc8 100644
--- a/container-images/gerrit-init/Dockerfile
+++ b/container-images/gerrit-init/Dockerfile
@@ -1,4 +1,4 @@
-FROM k8sgerrit/gerrit-slave:latest
+FROM gerrit-base:latest
 
 USER root
 
@@ -11,4 +11,4 @@
 
 USER gerrit
 
-ENTRYPOINT ["/bin/bash", "-c", "/var/tools/verify_fs_permissions && /var/tools/start"]
\ No newline at end of file
+ENTRYPOINT ["/bin/bash", "-c", "/var/tools/verify_fs_permissions && /var/tools/start"]