as it now passes.  Added some extra tests to breakpoint_creation_by_filespec_python().

More clarification for the "os command" output and error as defined in
lldbtest.system() function.

Cleaned up the option processing of the test driver (dotest.py) and fixed the comment
about enabling gdb-remote logging.  Example:

$ GDB_REMOTE_LOG=/tmp/log.txt ./dotest.py -v -t enum_types

llvm-svn: 113868