added sensu package, change pinning for mcp

Change-Id: I4734aa6e374bc535ee28cfa0d7e3f9b81d995756
diff --git a/linux/system/repo/sensu.yml b/linux/system/repo/sensu.yml
new file mode 100644
index 0000000..1ea3687
--- /dev/null
+++ b/linux/system/repo/sensu.yml
@@ -0,0 +1,8 @@
+parameters:
+  linux:
+    system:
+      repo:
+        sensu:
+          source: "deb https://sensu.global.ssl.fastly.net/apt ${_param:linux_system_codename} main"
+          architectures: amd64
+          key_url: "https://sensu.global.ssl.fastly.net/apt/pubkey.gpg"
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