fix a bug(the sequence of add and remove operation in send)

Signed-off-by: liuyao <lygoesstraight@163.com>
resend using pendings

Signed-off-by: liuyao <lygoesstraight@163.com>
resend check and action based on scheduler

Signed-off-by: liuyao <lygoesstraight@163.com>
modification of message consume in clusterEP

Signed-off-by: liuyao <lygoesstraight@163.com>