fixes CC-574: make vhost configuration less onerous

https://jira.zenoss.com/browse/CC-574

TODO: remove hostaliases since they are now unused
TODO: fix add virtual host button in CC UI

DEMOs:

![screen shot 2014-12-10 at 23 56 28](https://cloud.githubusercontent.com/assets/2837923/5389851/f55a100c-80c8-11e4-86e5-2a0c25d7921c.png)
![screen shot 2014-12-10 at 23 56 58](https://cloud.githubusercontent.com/assets/2837923/5389850/f559c9b2-80c8-11e4-8fa2-3973518dd820.png)
![screen shot 2014-12-10 at 23 57 04](https://cloud.githubusercontent.com/assets/2837923/5389848/f557d530-80c8-11e4-9822-5194ecdcb4be.png)
![screen shot 2014-12-10 at 23 57 09](https://cloud.githubusercontent.com/assets/2837923/5389853/f55c2662-80c8-11e4-9513-2a99a711e51c.png)
![screen shot 2014-12-10 at 23 58 17](https://cloud.githubusercontent.com/assets/2837923/5389849/f55858ca-80c8-11e4-9ebe-856fc367b50c.png)
![screen shot 2014-12-11 at 0 01 08](https://cloud.githubusercontent.com/assets/2837923/5389852/f55ac6c8-80c8-11e4-904c-551aa4d3ff40.png)