This reverts commit 9c4162a and 16baa12

Before change: exception when change compute offering (to dynamic service offering) on UI
After change: succeed

… nic profile exists

…ace/mac address issues

…ult gw

…o master

  - This also refactors the CsAddress in order to offer better readability in a couple of methods.

…elated changes

…ix typos

…aces #1519

…e.service