Remove the __import__ hack of lldbtest_config.

I think the underlying problem was fixed by r251819, but I can't
reproduce the problem.  So this is to check whether it does in
fact fix the problem.

llvm-svn: 251822

lldb/packages/Python/lldbsuite/test/dotest.py

@@ -19,15 +19,12 @@ for available options.
 """
 
 from __future__ import print_function
-# this module needs to have global visibility, otherwise test cases
-# will import it anew in their local namespace, essentially losing access
-# to all the configuration data
-globals()['lldbtest_config'] = __import__('lldbtest_config')
 
 import use_lldb_suite
-
 import lldbsuite
 
+import lldbtest_config
+
 import atexit
 import commands
 import importlib