PON requirement docs and seq diagrams

Please review and comment.

Change-Id: Iccec623e25bd723816c235cd4dd1a3b6d54e7d85
diff --git a/docs/sequences/cold-start-high-level.svg b/docs/sequences/cold-start-high-level.svg
new file mode 100644
index 0000000..cec5d68
--- /dev/null
+++ b/docs/sequences/cold-start-high-level.svg
@@ -0,0 +1,3906 @@
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+  <title
+     id="title3564">blockdiag</title>
+  <desc
+     id="desc3566">seqdiag {
+
+    net [label = 'Upstream Network'];
+    pon-mgr [label = 'PON-Mgr\n(placeholder)'];
+    raidus [label = 'RADIUS server'];
+    onos [label = 'ONOS'];
+    voltha [label = 'Voltha'];
+    olt [label = 'OLT\n(and adapter)'];
+    onu [label = 'ONU'];
+    rg [label = 'RG'];
+
+    autonumber = True;
+
+    === Initial state ===
+
+    //rg -&gt; olt [label = 'EA-POL-REQ', failed];
+
+    pon-mgr =&gt; voltha [label = 'Add_Olt_Device()', return = 'return'] {
+        voltha --&gt; pon-mgr [label = 'return for Add_Olt_Device()'];
+        voltha =&gt; olt      [label = 'Connect()'];
+        voltha =&gt; olt      [label = 'Activate()', note = 'foo'];
+        voltha -&gt; onos     [label = 'Connect'];
+        voltha -&gt; onos     [label = 'New port(s)', folded = true];
+
+    };
+
+}
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+         font-weight="normal"
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+         style="font-style:normal;font-weight:normal;font-size:11px;font-family:sans-serif;text-anchor:middle;fill:#000000">Initial state</text>
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