Merge branch 'stable/1710' of https://gerrit.fd.io/r/vpp into 17101710

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+VPP has now been built, installed, and started.
+
+To give it a spin, we can create a tap interface and try a simple ping
+(with trace).
+
+Make sure you have run:
+
+$ vagrant ssh
+
+To get to the vagrant VM:
+
+vagrant@localhost:~$
+
+Confirm that vpp is running with
+
+vagrant@localhost:~$ sudo status vpp
+vpp start/running, process 25202
+
+To create the tap:
+
+vagrant@localhost:~$ sudo vppctl tap connect foobar
+Created tap-0 for Linux tap 'foobar'
+vagrant@localhost:~$ sudo vppctl show int
+
+To assign it an ip address (and 'up' the interface):
+
+vagrant@localhost:~$ sudo vppctl set int ip address tap-0 192.168.1.1/24
+vagrant@localhost:~$ sudo vppctl set int state tap-0 up
+
+To turn on packet tracing for the tap interface:
+vagrant@localhost:~$ sudo vppctl trace add tapcli-rx 10
+
+Now, to set up and try the other end:
+vagrant@localhost:~$ sudo ip addr add 192.168.1.2/24 dev foobar
+vagrant@localhost:~$ ping -c 3 192.168.1.1
+
+To look at the trace:
+vagrant@localhost:~$ sudo vppctl show trace
+
+And to stop tracing:
+
+vagrant@localhost:~$ sudo vppctl clear trace
+
+Other fun things to look at:
+
+The vlib packet processing graph:
+vagrant@localhost:~$ sudo vppctl show vlib graph
+
+which will produce output like:
+
+           Name                      Next                    Previous
+ip4-icmp-input                  error-punt [0]               ip4-local
+                                ip4-icmp-echo-request [1]
+                                vpe-icmp4-oam [2]
+
+To read this, the first column (Name) is the name of the node.
+The second column (Next) is the name of the children of that node.
+The third column (Previous) is the name of the parents of this node.
+
+To see this README again:
+cat /vagrant/README