Added a new "lldb" log channel named "os" for the OperatingSystem plug-ins to use.

Added logging for the OS plug-in python objects in OperatingSystemPython so we can see the python dictionary returned from the plug-in when logging is enabled.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@182530 91177308-0d34-0410-b5e6-96231b3b80d8