Removed API_RATE_LIMIT per commit f617a2ddddf7d8f759ff3ca5d66a133b124eeb42.
Removed STACK_LOG in favor of LOGFILE as per devstack/stackrc#L845
Change-Id: I841757bd6ad4889fddcc626bed0de03731918fa5
This attempts to provide local.conf support by making it possible to
have local.conf files during initial processing and concattenating
them to the end of the final local.conf.
This is not fool proof, but given the limited ways that we currently
use configs in devstack-gate, it's good enough to start the
transition.
Depends-On: Ia19d64ba240adc642284e4b942f6ce12310f862b
Change-Id: I3347c0886b1c2c8c56c902f485f45fb126446451