Merge pull request #5925 from volta-networks/synchronous_client

zebra: synchronous client queues accumulate messages from zebra

diff --cc ldpd/lde.c
Simple merge

diff --cc lib/zclient.c
Simple merge

diff --cc lib/zclient.h
Simple merge

diff --cc zebra/redistribute.c
Simple merge

diff --cc zebra/zapi_msg.c
Simple merge

diff --cc zebra/zserv.h
Simple merge