Remove some FIXMEs and debug logging
Remove some FIXMEs and debug logging

These FIXMEs don't need fixing now that I think it through some more.
The reply format is specific to drivers and the 'ending' flag is part of
the existing wire protocol that we need to support even if we don't
support multicall().

Change-Id: I834f0bb01513b5318f0b365948a7d9247feb49bf

dukhlov/oslo.messaging,redhat-openstack/oslo.messaging,ozamiatin/oslo.messaging,isyippee/oslo.messaging,magic0704/oslo.messaging,apporc/oslo.messaging,dims/oslo.messaging,zhurongze/oslo.messaging,stevei101/oslo.messaging,hkumarmk/oslo.messaging,zhurongze/oslo.messaging,JioCloud/oslo.messaging,magic0704/oslo.messaging,dims/oslo.messaging,dukhlov/oslo.messaging,viggates/oslo.messaging,isyippee/oslo.messaging,ozamiatin/oslo.messaging,stevei101/oslo.messaging,eayunstack/oslo.messaging,citrix-openstack-build/oslo.messaging,redhat-openstack/oslo.messaging,apporc/oslo.messaging,hkumarmk/oslo.messaging