Skeleton impls for remaining translators.

This patch provides NeutronTranslator boiler-plates for for ther
remaining Neutron elements, which are:

- FloatingIp
- VIP
- HealthMonitor
- Pool
- Member
- PoolHealthMonitor

The following are already included in the SecurityGroup Translator
patch (https://review.gerrithub.io/#/c/14194/):

- SecurityGroup
- Port
- Router
- Subnet

Change-Id: I47474418d1c5372f9a61b1064db9e2b62221e2f2