tests: Don't globally set tmux default-shell

run_term() uses tmux set-option -g to globally set the default shell.
Unfortunately this hits a chicken-and-egg problem that's common with many
of tmux's session options.  If there isn't already a tmux server running,
we can't connect to set the option.  If we attempt this after starting our
session (and therefore the server), then the session will already be
started with the previous default shell.

In any case it's not a good idea to set tmux global options, since that
might interfere with whatever else the user is doing in tmux.  So, instead
set the default-shell option locally to the session after starting it.  To
make sure we get the right shell for our initial script, explicitly invoke
/bin/sh to interpret it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

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