Remove the -b option from dotest.py

This removes the blacklist option as part of an effort to remove
unused / unmaintained command line options from the test suite.

llvm-svn: 255040

Remove +b option from dotest.py

llvm-svn: 255037

Remove the -D option from dotest.py.

This removes the option to dump Python sys.path variable as part
of an effort to remove unused options.

llvm-svn: 255035

Fixup dotest.py on mac for the configuration package

llvm-svn: 255013

Move LLDBTestResult class to its own module.

llvm-svn: 254983

Get rid of global variables in dotest.py

This moves all the global variables into a separate module called
`configuration`. This has a number of advantages:

1. Configuration data is centrally main

Get rid of global variables in dotest.py

This moves all the global variables into a separate module called
`configuration`. This has a number of advantages:

1. Configuration data is centrally maintained so it's easy to get
a high level overview of what configuration data the test suite
makes use of.
2. The method of sharing configuration data among different parts
of the test suite becomes standardized. Previously we would
put some things into the `lldb` module, some things into the
`lldbtest_config` module, and some things would not get shared.
Now everything is shared through one module and is available to
the entire test suite.
3. It opens the door to moving some of the initialization code into
the `configuration` module, simplifying the implementation of
`dotest.py`.

There are a few stragglers that didn't get converted over to using
the `configuration` module in this patch, because it would have grown
the size of the patch unnecessarily. This includes everything
currently in the `lldbtest_config` module, as well as the
`lldb.remote_platform` variable. We can address these in the future.

llvm-svn: 254982

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