Some features which Anbox offer may be useful to users, but can not
be officially supported.  For example, the recently added Stand-Alone
Mode can be utilised to make use of different types of independent
containers where Anbox does not control the complete life cycle, but
since these types of setups can be widely varying and complex, it
would not be impossible to provide support.  Thus, when running in
these modes, it's important for the user to show knowledge that they
are operating in an experimental way.  This functionality provided
by issuing the --experimental flag when starting the Session Manager.

Signed-off-by: Lee Jones <lee.jones@linaro.org>