func (c *RaftCluster) MemberByName(name string) *Member {
	c.Lock()
	defer c.Unlock()
	var memb *Member
	for _, m := range c.members {
		if m.Name == name {
			if memb != nil {
				if c.lg != nil {
					c.lg.Panic("two member with same name found", zap.String("name", name))
				} else {
					plog.Panicf("two members with the given name %q exist", name)
				}
			}
			memb = m
		}
	}
	return memb.Clone()
}
func (c *RaftCluster) MemberByName(name string) *Member {
	c.Lock()
	defer c.Unlock()
	var memb *Member
	for _, m := range c.members {
		if m.Name == name {
			if memb != nil {
				if c.lg != nil {
					c.lg.Panic("two member with same name found", zap.String("name", name))
				} else {
					plog.Panicf("two members with the given name %q exist", name)
				}
			}
			memb = m
		}
	}
	return memb.Clone()
}
// MemberByName returns a Member with the given name if exists.
// If more than one member has the given name, it will panic.