Add iops fact and add it to astute

Astute needs to know how many nodes can
be provisioned at a time, based on IOPS.

Change-Id: If2cf35ac8195baf37cda50564b70ba3db836ccea
Partial-Bug: #1355347

deployment/puppet/nailgun/lib/facter/iops.rb

@@ -0,0 +1,15 @@
+require 'facter'
+
+# Requires sysstat package on Ubuntu and CentOS
+# Fact iops totals tps values from iostat
+
+Facter.add('iops') do
+  confine :kernel => :linux
+  str = Facter::Util::Resolution.exec("iostat | grep -v 'dm-'" \
+                                      " | awk '{print $2}'")
+  iops = 0
+  str.split("\n").each do |iops_val|
+    iops = iops + iops_val.to_f
+  end
+  setcode { iops }
+end

deployment/puppet/nailgun/templates/astuted.conf.erb

@@ -5,5 +5,6 @@ broker_password: '<%= @rabbitmq_astute_password %>'
 broker_queue: 'naily'
 broker_publisher_queue: 'nailgun'
 broker_exchange: 'nailgun'
+iops: <%= @iops %>
 #reboot_timeout: 120              # Wait for reboot request
 #provisioning_timeout: 5400       # Timeout for target nodes to install OS