Some test cases that need the lldbExec path were failing because lldbExec was...

Some test cases that need the lldbExec path were failing because lldbExec was turning out to be None even though it was being validly set by dotest.py

It turns out that lldbtest_config was being imported locally to "lldbsuite.test" instead of globally, so when the test cases got individually brought by a global import via __import__ by unittest2, they did not see the lldbtest_config import, and ended up importing a new separate copy of it, with lldbExec unset

This is a simple hackaround that brings lldbtest_config to global visibility and makes sure the configuration data is correctly shared

llvm-svn: 251678