Install logrotate formula during SaltMaster bootstrap

Logrotate is basic system functionality we should manage on each host.
Since we are going to add it to linux.single metadata, it should be
preinstalled on cfg node to render pillar successfully.

Change-Id: I72aecb3a9ce4010e5cb43fa323c8b7e54c5f9243
Related-Prod: PROD-19346
diff --git a/classes/cluster/virtual-mcp-mitaka-dvr/.env b/classes/cluster/virtual-mcp-mitaka-dvr/.env
index d2e169a..7146e72 100644
--- a/classes/cluster/virtual-mcp-mitaka-dvr/.env
+++ b/classes/cluster/virtual-mcp-mitaka-dvr/.env
@@ -1 +1 @@
-EXTRA_FORMULAS="ntp sphinx nginx heka grafana rsyslog prometheus telegraf memcached collectd fluentd"
+EXTRA_FORMULAS="ntp sphinx nginx heka grafana rsyslog prometheus telegraf memcached collectd fluentd logrotate"