Luajit API and some examples

Change-Id: Ia140c4750f06870c40b7058c4afb2e20ca633a49
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

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+LUTE: Lua Unit Test Environment
+
+This is a small helper utility to automate some simple tests
+that one might need to do.
+
+Think of it as a hybrid of a screen and expect who
+also took some habits from HTML inline code.
+
+It is quite probably useless for building anything serious,
+but practice shows it is quite efficient at allowing
+convenient temporary quick tests, and for something
+that was written over a course of a couple of evenings it
+is quite a nice little helper tool.
+
+It allows do launch and drive multiple shell sessions,
+and by virtue of having been written in Lua, it of course
+also allows to add the business logic using the Lua code.
+
+If you launch the lute without parameters, it gives you
+the interactive shell to execute the commands in.
+
+If you launch it with an argument, it will attempt to
+read and execute the commands from the file.
+
+Commands:
+
+shell FOO
+
+  spawn a shell in a new PTY under the label FOO.
+
+run FOO bar
+
+  Send "bar" keystrokes followed by "ENTER" to the session FOO
+
+  Special case: "break" word on its own gets translated into ^C being sent.
+
+cd FOO
+
+  "change domain" into session FOO. All subsequent inputs will go,
+  line-buffered, into the session FOO. To jump back up, use ^D (Control-D),
+  or within the file, use ^D^D^D (caret D caret D caret D on its own line)
+
+expect FOO blablabla
+
+  Pause further interpretation of the batch mode until you see "blablabla"
+  in the output of session FOO, or until timeout happens.
+
+sleep N
+
+  Sleep an integer N seconds, if you are in batch mode.
+
+echo blabla
+
+  Echo the remainder of the line to standard output.
+
+For Lua code, there is a pre-existing pseudo-session called "lua",
+which accepts "run lua" command which does what you would expect
+(evaluate the rest of the string in Lua context - being the same
+as lute itself). Also you can do "cd lua" and get into a
+multiline-enabled interpreter shell.
+
+This way for the VPP case you can automate some of the things in your routine
+that you would have to have done manually, and test drive API as well
+as use the realistic native OS components to create the environment around it.
+
+