Add prometheus exporters installation

Change-Id: If7624ef44661138510681a492d68b81350eaa081
diff --git a/scripts/stacklightv2_infra_install.sh b/scripts/stacklightv2_infra_install.sh
index 8ce538a..12cef91 100755
--- a/scripts/stacklightv2_infra_install.sh
+++ b/scripts/stacklightv2_infra_install.sh
@@ -16,6 +16,9 @@
 # Configure Telegraf
 salt -C 'I@telegraf:agent or I@telegraf:remote_agent' state.sls telegraf
 
+# Configure Prometheus exporters
+salt -C 'I@prometheus:exporters' state.sls prometheus
+
 # Configure log_collector
 salt -C 'I@heka:log_collector' state.sls heka.log_collector