CORD-837 - update diagram to include quagga

Change-Id: I84c2670d3141656912aa726e4be03ca96c59e6c4
diff --git a/docs/images/physical.graffle b/docs/images/physical.graffle
index 0cecc95..96c95c5 100644
--- a/docs/images/physical.graffle
+++ b/docs/images/physical.graffle
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diff --git a/docs/images/physical.png b/docs/images/physical.png
index 7584944..229b151 100644
--- a/docs/images/physical.png
+++ b/docs/images/physical.png
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