Fix global proxy processing

   * Fix processing disabled repo
   * Extend tests for such case

Change-Id: Ib3243f2b3e70aecef65273be215b30613b8df025
Closes-Bug: PROD-21954 (PROD:21954)
diff --git a/tests/pillar/system.sls b/tests/pillar/system.sls
index 54176a1..3540511 100644
--- a/tests/pillar/system.sls
+++ b/tests/pillar/system.sls
@@ -126,6 +126,15 @@
       htop:
         version: latest
     repo:
+      disabled_repo:
+        source: "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
+        enabled: false
+      disabled_repo_left_proxy:
+        source: "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
+        enabled: false
+        proxy:
+          enabled: true
+          https: https://127.0.5.1:443
       opencontrail:
         source: "deb http://ppa.launchpad.net/tcpcloud/contrail-3.0/ubuntu xenial main"
         keyid: E79EE90C