roomservice: Set timeout when accessing GitHub

* Bypasses the literally infinite timeout for users who have
  limited access to GitHub (before: 2m13.749s, after: 0m14.354s)
* The timeouts should be enough for users who have freedom internet
  access, even ADSL network connection shouldn't take that long...

Test:
1. Execute `source build/envsetup.sh`
2. `breakfast` a existing device
3. Add "0.0.0.1 github.com" and "0.0.0.1 raw.githubusercontent.com"
   to /etc/hosts
4. `breakfast` any device, observe that it should not take up to
   minutes to quit

Change-Id: Ib90e69c75a50e66b47e6245cb6d0521351b5c71b