eclass/lua-utils.eclass: Add support for test-runners

During migration of dev-lua/* ebuilds to slotted lua, I noticed, that
many ebuilds use 'dev-lua/busted' for running tests. This change adds
support for running a test-runner, at first only 'busted' for now.
Also a non-color and plaintext output will be used for the test-runner 'busted'.

This is basically a copy of the test-runner section, written by mgorny,
which already exists in 'distutils-r1', but modified and adapted to lua.

In order to use this feature, you can define 'lua_enable_tests busted'
to setup everything needed for tests and run them. By default,
'dev-lua/busted' assumes, that tests are in the 'spec' folder.

If this is not the case, you can add a second argument to specify a
different folder. For example, if the folder is called 'foo', you can
just run 'lua_enable_tests busted foo'.

More test-runners can be added in future, if needed.

Signed-off-by: Conrad Kostecki <conikost@gentoo.org>

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