When building the guest image for dev_mode=true, the controller IP
address is injected to the image in order for the guest-agent to
download Trove code during initialization. As a result, we have to build
guest image each time in the Trove CI because the image build relies on
the devstack host IP address.
If we could remove the dependency, we can build the image(in
devmode=true) for a specific datastore once and use that image for all
related CI jobs, which could save some time for Trove CI.
Fix the current CI issue as well.
Change-Id: If23f4f179a6ab72cfb35e4c45d55142fedb76498
8fc0b7695d