1129817 - prepend process id and thread id if line is split

By including a unique identifier, it is possible to separate logs that are generated at the same time.

 [Bugzilla-1129817](https://bugzilla.redhat.com/show_bug.cgi?id=1129817)
I think something might be wrong here. I've been trying to use this new handler as part of reviewing this pull request, and I've found that this line causes a traceback when messages get long enough to split. For reference, I added this code to the bottom of logs.py:

```
CompliantSysLogHandler.MAX_MSG_LENGTH = 30
start_logging()
log = logging.getLogger('randy')
log.info('123456789012')
log.info("This is a'OK")
log.info('This is too long.')
```

Then when I run just this file with a Python interpreter:

```
(pulp)[rbarlow@notepad]~/devel/pulp% python server/pulp/server/logs.py 
Traceback (most recent call last):
  File "server/pulp/server/logs.py", line 232, in <module>
    log.info('This is too long.')
  File "/usr/lib64/python2.6/logging/__init__.py", line 1056, in info
    self._log(INFO, msg, args, **kwargs)
  File "/usr/lib64/python2.6/logging/__init__.py", line 1173, in _log
    self.handle(record)
  File "/usr/lib64/python2.6/logging/__init__.py", line 1183, in handle
    self.callHandlers(record)
  File "/usr/lib64/python2.6/logging/__init__.py", line 1220, in callHandlers
    hdlr.handle(record)
  File "/usr/lib64/python2.6/logging/__init__.py", line 679, in handle
    self.emit(record)
  File "server/pulp/server/logs.py", line 137, in emit
    for message_chunk in CompliantSysLogHandler._cut_message(line, formatter_buffer, msg_id, self.log_id):
  File "server/pulp/server/logs.py", line 209, in _cut_message
    while (ord(message[i + relative_ending_index]) >> 6) == 2:
IndexError: string index out of range
```

I'm surprised that the unit tests do not cover this. They must not have a test case like this. See if you can create a new unit test with this kind of test case to reproduce, and then make sure that test passes as well.