Workaround for the missing CA salt master cert

Change-Id: I7d1b7b4d7c8fe0d33dbb0169c69bd1965962e302
Related-Bug: PROD-18262
diff --git a/scripts/infra_install.sh b/scripts/infra_install.sh
index 6166440..de3b853 100755
--- a/scripts/infra_install.sh
+++ b/scripts/infra_install.sh
@@ -12,5 +12,8 @@
 
 sleep 5
 
+# Run for CA generation. CA will be generated right after 'salt.minion' state.
+salt -C 'I@salt:master' state.sls salt.minion.ca
+
 # Bootstrap all nodes
 salt "*" state.sls linux,openssh,salt.minion,ntp,rsyslog