Boost guest memory
Boost guest memory

With 2GB of ram, certain tests were timing out and not able to complete.
This commit bumps up that base setting to 5GB to be safe.

marxarelli/vagrant,chrisroberts/vagrant,marxarelli/vagrant,chrisroberts/vagrant,mitchellh/vagrant,chrisroberts/vagrant,sni/vagrant,marxarelli/vagrant,mitchellh/vagrant,mitchellh/vagrant,marxarelli/vagrant,sni/vagrant,sni/vagrant,chrisroberts/vagrant,sni/vagrant,mitchellh/vagrant