Add aptcacher formula

Change-Id: I44c6fe23f9831767dcc142b25c3696e866bc91e7
diff --git a/jenkins/client/job/salt-formulas/tests.yml b/jenkins/client/job/salt-formulas/tests.yml
index 6988392..269fd54 100644
--- a/jenkins/client/job/salt-formulas/tests.yml
+++ b/jenkins/client/job/salt-formulas/tests.yml
@@ -7,6 +7,7 @@
           jobs:
             - name: aodh
             - name: apache
+            - name: aptcacher
             - name: aptly
             - name: artifactory
             - name: backupninja