Passing in os.ctermid() as the arg for SBTarget.Launch(...) for stdin_path,...

Passing in os.ctermid() as the arg for SBTarget.Launch(...) for stdin_path, stdout_path, and stderr_path
is just wrong and resulted in the inferior's output getting mixed into the GDB remote communication's
log file.  Change all test cases to not pass os.ctermid() and either use SBTarget.LaunchSimple() or
SBTarget.Launch() and pass None as stdin_path/stdout_path/srderr_path to use a pseudo terminal.

rdar://problem/9716499 program output is getting mixed into the GDB remote communications

llvm-svn: 134940