Fix mirascan build jobs

Currently they are defined in salt-multi and salt.yml
we need to build only from master branch.

Change-Id: I745fda81255fc85334419c800bc1c51eaec61d2d
Related-Prod: https://mirantis.jira.com/browse/PROD-17902
diff --git a/jenkins/client/job/debian/packages/salt-multi.yml b/jenkins/client/job/debian/packages/salt-multi.yml
index f7a87c7..a81302e 100644
--- a/jenkins/client/job/debian/packages/salt-multi.yml
+++ b/jenkins/client/job/debian/packages/salt-multi.yml
@@ -56,9 +56,6 @@
             - name: kubernetes
               upload_source_package: true
               dist: xenial
-            - name: mirascan
-              upload_source_package: true
-              dist: xenial
             - name: neutron
               upload_source_package: true
               dist: xenial