Reduce the number of gvfsd related processes

gvfsd is needed so that we can see and mount network services in Filer. However, do we really need __all__ those?

```
2567 - I 0:00,06 /usr/local/libexec/gvfsd
2570 - I 0:00,38 /usr/local/libexec/gvfsd-fuse /var/run/user/1001/gvf
2574 - I 0:00,01 /usr/local/libexec/gvfs-hal-volume-monitor
2576 - S 0:00,55 /usr/local/libexec/gvfsd-trash --spawner :1.4 /org/g
2578 - I 0:00,01 /usr/local/libexec/gvfs-gphoto2-volume-monitor
17473 - I 0:00,29 /usr/local/libexec/gvfsd-network --spawner :1.4 /org
17560 - I 0:00,01 /usr/local/libexec/dconf-service
17562 - I 0:00,27 /usr/local/libexec/gvfsd-dnssd --spawner :1.4 /org/g
```