Encapsulate config.rb into TestSuiteConfig class
Similar to #9030, it’s potentially problematic to define stuff in the
global context except classes and modules. We could fix this pretty
easily by implementing a
TestSuiteConfig class that inherits from
Hash, and does the YAML stuff in
initialize and then do
$config = TestSuiteConfig.new in the global context (which is fine). That
wouldn’t require any change to code using
$config anywhere else.
We probably should move the constants into this class too, which would
TAILS_ISO to be changed to
which actually looks like a good thing since it’s easier to understand
that the constant is part of the test suite’s configuration.
Parent Task: #10237