Don't die if we can't move logs

This is in reaction to errors like:

```
Traceback (most recent call last):
  File "/usr/bin/daemon-runner", line 9, in <module>
    load_entry_point('daemon-runner==0.0.14', 'console_scripts', 'daemon-runner')()
  File "/usr/lib/python2.6/site-packages/daemon_runner.py", line 52, in main
    watch_process(args, args.pid_file or None)
  File "/usr/lib/python2.6/site-packages/daemon_runner.py", line 90, in watch_process
    move_logs(args)
  File "/usr/lib/python2.6/site-packages/daemon_runner.py", line 138, in move_logs
    shutil.move(filename, new_filename)
  File "/usr/lib64/python2.6/shutil.py", line 260, in move
    copy2(src, real_dst)
  File "/usr/lib64/python2.6/shutil.py", line 95, in copy2
    copyfile(src, dst)
  File "/usr/lib64/python2.6/shutil.py", line 50, in copyfile
    with open(src, 'rb') as fsrc:
IOError: [Errno 2] No such file or directory: '/usr/share/[ Redacted ]/Spitfire.out'
```

@axiak