Cleanup: Remove fun from code base

Cleanup: Remove fun from code base

It appears choosing the release names provides plenty of enjoyment to
LTTng developers, thus allowing us to remove those easter eggs.

Incidentally, it will allow me to demo the LTTng project without
carrying this <yellow>Welcome back Dr Tracing!</yellow> message each
time I issue a "lttng" command.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>