Allow backward compatibility to ustctl <= 0.11 for some commands

The rewrite of the ustctl broke all the existing scripts
that make use of ustctl.  This allows the original commands,
examples, and external scripts to continue working properly.

This covers the commands:

--list-markers
--list-trace-events
--alloc-trace
--start-trace
--stop-trace
--create-trace
--destroy-trace
--enable-marker
--disable-marker

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Nils Carlson <nils.carlson@ericsson.com>