LLDB test suite should also output the config info string along with the stack trace.

rdar://problem/11283401

Example:

Collected 1 test

1: test_with_dwarf (TestCallStdStringFunction.ExprCommandCallFunctionTestCase)
   Test calling std::String member function. ... FAIL

======================================================================
FAIL: test_with_dwarf (TestCallStdStringFunction.ExprCommandCallFunctionTestCase)
   Test calling std::String member function.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Volumes/data/lldb/svn/ToT/test/lldbtest.py", line 427, in wrapper
    return func(self, *args, **kwargs)
  File "/Volumes/data/lldb/svn/ToT/test/expression_command/call-function/TestCallStdStringFunction.py", line 34, in test_with_dwarf
    self.call_function()
  File "/Volumes/data/lldb/svn/ToT/test/expression_command/call-function/TestCallStdStringFunction.py", line 48, in call_function
    substrs = ['Hello world'])
  File "/Volumes/data/lldb/svn/ToT/test/lldbtest.py", line 1235, in expect
    msg if msg else EXP_MSG(str, exe))
AssertionError: False is not True : 'Hello world' returns expected result
Config=i386-clang
----------------------------------------------------------------------
Ran 1 test in 1.148s

FAILED (failures=1)

llvm-svn: 155157