Add an example flashrd role

This is all I needed to do now that the flashrd.site patches are in
flashrd's github repo.

This was as simple as `echo role-flashrd >> common/siteXX/roles`
and it just worked.  (I am sure that some things also needed to be
adjusted for the readonly filesystems but it boots up)

examples/role-flashrd/flashrd.site

@@ -0,0 +1,18 @@
+active_interface() {
+    ifconfig | awk '
+        BEGIN { A = "" };
+        /^[^[:space:]]/ { if (A == "") { INT = $1 } };
+        /status: active/ { A=1 };
+        END { if (A != "") { sub(":", "", INT); print INT } }
+    '
+}
+
+int=`active_interface`
+
+if [ -n "$int" ]; then
+    dhclient $int
+else
+    echo Unable to find an active interface, no network enabled
+fi
+
+. /install.site

examples/role-flashrd/siteXX/mtree

@@ -0,0 +1,40 @@
+#	   user: andrew
+#	machine: trillian.afresh1.com
+#	   tree: /tmp/sxxu.rEcuDJGDe/role-flashrd
+#	   date: Sun Apr 21 19:16:19 2013
+
+# .
+/set type=file uid=0 gid=0 mode=0644
+.               type=dir mode=0755
+    flashrd.site
+    flashrd.site~
+
+# ./etc
+etc             type=dir mode=0755
+# ./etc
+..
+
+
+# ./var
+/set type=file uid=0 gid=0 mode=0755
+var             type=dir
+
+# ./var/siteXX
+/set type=file uid=0 gid=0 mode=0644
+siteXX          type=dir mode=0755
+    roles      
+
+# ./var/siteXX/role-flashrd
+role-flashrd    type=dir mode=0755
+    mtree      
+# ./var/siteXX/role-flashrd
+..
+
+# ./var/siteXX
+..
+
+# ./var
+..
+
+..
+