[OFFLINE][Salt] Add a new saltstack repo to offline

Closes-Bug: PROD-35387
Change-Id: I45dc98ea0b42b54cb86e48dd27b3ee8479f68061
diff --git a/defaults/debmirror.yml b/defaults/debmirror.yml
index cef73b5..c9f7820 100644
--- a/defaults/debmirror.yml
+++ b/defaults/debmirror.yml
@@ -30,5 +30,6 @@
     mirror_mirantis_com_salt-formulas_xenial_force: True
     mirror_mirantis_com_saltstack_2016_3_xenial_force: False
     mirror_mirantis_com_saltstack_2017_7_xenial_force: False
+    mirror_mirantis_com_salt_2017_7_8_xenial_force: False
     mirror_mirantis_com_td_agent_xenial_force: False
     mirror_mirantis_com_ubuntu_xenial_force: False