lib.sh,hijack.sh: restore ability to be sourced interactively #1071
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Run
start_test()
andfunc_exit_handler()
only in "normal" usage, notwhen sourced interactively (for interactive debug) and not as a subtest.
With this commit it's not possible to do this without any side-effect:
More to the point, it's now possible to run this and start interactive
testing without any unwanted actions: