bump zookeeper from 3.4.5 to 3.4.6

depends on zookeeper 3.4.6 from Godeps:
  github.com/samuel/go-zookeeper/zk 4a222ca51b4c7ca6f2895e0e68af2e9254acfdcc
from:
  https://github.com/control-center/serviced/pull/1364

zookeeper 3.4.6 release notes (different from 3.4.5):
  http://zookeeper.apache.org/doc/r3.4.6/releasenotes.html

DEMO:
```
# plu@plu-9: docker ps --no-trunc |grep serviced-isvcs_zookeeper
ba4fd639724ac74f841ecb6636287d6d1b3ea7cc42cf5251f8df3b56e55c06c8   zenoss/serviced-isvcs:v24                                  "/bin/sh -c '/opt/zookeeper-3.4.6/bin/zkServer.sh start-foreground'"                                                                                                                                                                                                                                                                                                                    13 minutes ago       Up 13 minutes                                                                                      serviced-isvcs_zookeeper                

```

DEMO - pushed to dockerhub:
```
# plu@plu-9: docker push zenoss/serviced-isvcs:v24
The push refers to a repository [zenoss/serviced-isvcs] (len: 1)
Sending image list
Pushing repository zenoss/serviced-isvcs (1 tags)
...
6bbe07763f16: Image successfully pushed 
Pushing tag for rev [6bbe07763f16] on {https://cdn-registry-1.docker.io/v1/repositories/zenoss/serviced-isvcs/tags/v24}

```

![screen shot 2014-12-09 at 13 46 23](https://cloud.githubusercontent.com/assets/2837923/5364513/d5a7eaa6-7fa9-11e4-95b4-3ebfcc9a5ffb.png)