Allow override repo name

- allow multiple repos configured on one system (nightly/testing/stable)
diff --git a/linux/system/repo.sls b/linux/system/repo.sls
index 2ba2114..8044829 100644
--- a/linux/system/repo.sls
+++ b/linux/system/repo.sls
@@ -39,7 +39,7 @@
 {%- endif %}
 
 {%- for name, repo in system.repo.iteritems() %}
-
+{%- set name=repo.get('name', name) %}
 {%- if grains.os_family == 'Debian' %}
 
 # per repository proxy setup