Adding Nagios Support

This commit adds an option to install Nagios to monitor the
openstack components. Initially we are only monitoring a small
subset of what could eventually be monitored
http://bugzilla.redhat.com/show_bug.cgi?id=912768

Change-Id: I176876e5ecc35e7c58ef49534341939fd7998701

packstack/puppet/templates/nagios_nrpe.pp

@@ -0,0 +1,41 @@
+package{'nrpe':
+    ensure => present,
+    before => Class['nagios_configs']
+}
+
+class nagios_configs(){
+
+    file_line{'allowed_hosts':
+        path => '/etc/nagios/nrpe.cfg',
+        match => 'allowed_hosts=',
+        line => 'allowed_hosts=%(CONFIG_NAGIOS_HOST)s',
+    }
+
+    # 5 minute load average
+    file_line{'load5':
+        path => '/etc/nagios/nrpe.cfg',
+        match => 'command\[load5\]=',
+        line => 'command[load5]=cut /proc/loadavg -f 1 -d " "',
+    }
+
+    # disk used on /var
+    file_line{'df_var':
+        path => '/etc/nagios/nrpe.cfg',
+        match => "command\[df_var\]=",
+        line => "command[df_var]=df /var/ | sed -re 's/.* ([0-9]+)%%.*/\\1/' | grep -E '^[0-9]'",
+    }
+}
+class{'nagios_configs':
+    notify => Service['nrpe'],
+}
+
+service{'nrpe': 
+    ensure => running,
+    hasstatus => true,
+}
+
+firewall { '001 nrpe incoming':
+    proto    => 'tcp',
+    dport    => ['5666'],
+    action   => 'accept',
+}