added beacons configuration support

pillar.example

     auth_keytab: /root/auth.keytab
     auth_principal: kadmin/admin
 
-		# optional engine configuration
+    # optional engine configuration
     engines:
       slack:
         token: xoxp-XXXXX-XXXXXXX
             type: runner
             cmd: jobs.list_jobs
 
+    # optional beacons configuration
+    beacons:
+      load:
+        1m:
+          - 0.0
+          - 2.0
+        5m:
+          - 0.0
+          - 1.5
+        15m:
+          - 0.1
+          - 1.0
+        interval: 10
+
 
   # salt cloud config
   cloud:

salt/files/minion.d/beacons.conf

+#
+# This file is managed by Salt! Do not edit by hand!
+#
+{%- set beacons = salt['pillar.get']('salt:beacons') -%}
+{%- set engines = salt['pillar.get']('salt:minion:beacons', default=engines, merge=True) -%}
+{%- if beacons %}
+beacons:
+  {{ beacons | yaml(False) | indent(2) }}
+{%- endif -%}

salt/files/minion.d/f_defaults.conf

 # This file managed by Salt, do not edit by hand!!
 #  Based on salt version 2015.8.7 default config
 #
-{% set reserved_keys = ['master', 'minion', 'cloud', 'salt_cloud_certs', 'engines'] -%}
+{% set reserved_keys = ['master', 'minion', 'cloud', 'salt_cloud_certs', 'engines', 'beacons'] -%}
 {% set cfg_salt = pillar.get('salt', {}) -%}
 {% set cfg_minion = cfg_salt.get('minion', {}) -%}
 {% set default_keys = [] -%}