Add site_config.yaml back into examples

Spyglass uses additional configuration files to add in any information
not included by a data source. This configuration file should be usable
independent of the data source used. This change adds the
site_config.yaml example file back into the examples folder after it was
initially removed in the project separation of spyglass-plugin-xls.

Change-Id: I9be76c89076327b8ff928aa3da6c91cca0397cc2

spyglass/examples/site_config.yaml

@@ -0,0 +1,33 @@
+##############################################
+# Site Specific Spyglass XLS Plugin Settings #
+##############################################
+---
+site_info:
+  ldap:
+    common_name: test
+    url: ldap://ldap.example.com
+    subdomain: test
+  ntp:
+    servers: 10.10.10.10,20.20.20.20,30.30.30.30
+  sitetype: foundry
+  domain: atlantafoundry.com
+  dns:
+    servers: 8.8.8.8,8.8.4.4,208.67.222.222
+network:
+  vlan_network_data:
+    ingress:
+        subnet:
+        - 132.68.226.72/29
+  bgp :
+    peers:
+    - '172.29.0.2'
+    - '172.29.0.3'
+    asnumber: 64671
+    peer_asnumber: 64688
+storage:
+  ceph:
+    controller:
+      osd_count: 6
+...
+
+