fixes CC-574: make vhost configuration less onerous

https://jira.zenoss.com/browse/CC-574

DEMO - serviced.log after template is deployed:
```
I1211 05:52:24.392161 17383 cpserver.go:366] Running registry.WatchChildren for zookeeper path: /servicevhosts
```

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)
![screen shot 2014-12-11 at 0 08 54](https://cloud.githubusercontent.com/assets/2837923/5389983/05e6f59c-80ca-11e4-97a3-fd8828290f52.png)

DEMO
```
# plu@plu-9: serviced service list zenoss.core |grep --after=3 'VHosts'
       "VHosts": [
         "zenoss5x",
         "rm.foo.com"
       ],
```
![screen shot 2014-12-11 at 13 58 47](https://cloud.githubusercontent.com/assets/2837923/5401064/e656cbfc-813d-11e4-8bda-835ed2e241ff.png)

![screen shot 2014-12-11 at 13 30 09](https://cloud.githubusercontent.com/assets/2837923/5400501/e1f6e78a-8139-11e4-9357-6aa11b7d71dc.png)

![screen shot 2014-12-11 at 13 29 06](https://cloud.githubusercontent.com/assets/2837923/5400491/c7d0a7ba-8139-11e4-9eaa-b8a78b5bd719.png)

ditto