If network calls to retrieve ports and floating IPs take too long,
then the project > instances page cannot be loaded. This config
allows disabling the network calls when loading the page with
minor side-effects, as a workaround to avoid downtime while other
performance optimizations can be done on the side to allow
the page the load so the workaround is no longer needed.
Closes-bug: #2051003
Related-bug: #2045168
Change-Id: Iedad6ef48cbe0b776594f4ad8276d3d713cd360c
6b93e9dd87