squeezelite uses quite a lot of cpu even when doing "noting"

```
What steps will reproduce the problem?
1. run squeezelite on rasperry pi
2. look at the process with top
3. even when doing nothing (no client connected, no music streamed), it takes
around 2% CPU

What is the expected output? What do you see instead?
I can see in the logs that it constantly does something like

[11:41:19.155988] process_strm:232 strm command t
[11:41:19.156951] sendSTAT:164 STAT: STMt
[11:41:24.103024] process:469 strm
[11:41:24.103227] process_strm:232 strm command t
[11:41:24.103330] sendSTAT:164 STAT: STMt
[11:41:29.006545] process:469 strm
[11:41:29.006747] process_strm:232 strm command t
[11:41:29.006851] sendSTAT:164 STAT: STMt
[11:41:34.023485] process:469 strm
[11:41:34.023691] process_strm:232 strm command t
[11:41:34.023792] sendSTAT:164 STAT: STMt

What version of the product are you using? On what operating system?
Squeezelite v1.5 - RasperryPI with debian

Please provide any additional information below.

```

Original issue reported on code.google.com by `chrmhoff...@gmail.com` on 13 Apr 2014 at 9:42