Remove 'host' from OS X route types #483

Before:
```
./tools/profile.py --query "select * from routes;"
Profiling query: select * from routes;
manual (1/1):  duration: 0 (0.507874011993)   cpu_time: 0 (0.089365784)   memory: 1 (9289728)   fds: 0 (4)   utilization: 1 (8.8)  
manual   avg:  duration: 0 (0.507874011993)   cpu_time: 0 (0.089365784)   memory: 1 (9289728.0)   fds: 0 (4.0)   utilization: 1 (8.8)  
```

After:
```
./tools/profile.py --query "select * from routes;"
Profiling query: select * from routes;
manual (1/1):  duration: 0 (0.508569955826)   cpu_time: 0 (0.027407109)   memory: 0 (5644288)   fds: 0 (4)   utilization: 0 (2.6)  
manual   avg:  duration: 0 (0.508569955826)   cpu_time: 0 (0.027407109)   memory: 0 (5644288.0)   fds: 0 (4.0)   utilization: 0 (2.6)  
```