Revert "Fix: crm_resource: Wait for a reply for each request to crmd"

This reverts commit 768f9b22cade15d94c6931790e009bb51d79130d.
Redundant with 62e59ab
Fix: crmd: Do not send throttle updates to versions that don't support them
Fix: crmd: Don't start throttling until we're over the target threshold
Refactor: crmd: Fold the enforcement of migration-limit into the throttling code
Feature: crmd: Track the CIB's CPU usage
Refactor: crmd: Tell the DC our job limit instead of the number of cores
Fix: crmd: Honor load thresholds lower than the cib maximum