remove dbconfig-common config in purge

debian/postrm

@@ -90,6 +90,7 @@ ${gitlab_data_dir}; do
     fi
 
     nginx_site="/etc/nginx/sites-available/${GITLAB_HOST}"
+    dbconfig_config="/etc/dbconfig-common/gitlab.conf"
 
     if [ -f ${nginx_site} ]; then echo "Found nginx site configuration at ${nginx_site}..."; fi
 
@@ -103,10 +104,11 @@ ${gitlab_data_dir}; do
 	rm -f ${gitlab_yml}$ext
 	rm -f ${gitlab_tmpfiles}$ext
 	rm -f ${gitlab_shell_config}$ext
+        rm -f ${dbconfig_config}$ext
     done
  
     for i in ${nginx_site} ${gitlab_debian_conf} ${gitlab_yml} \
-${gitlab_tmpfiles} ${gitlab_shell_config}; do
+${gitlab_tmpfiles} ${gitlab_shell_config} ${dbconfig_config}; do
       # remove the configuration file itself
         safely_remove $i
       # and finally clear it out from the ucf database