url too many colons in address

[XiaoWeiKIN]

当注册中心或者元数据中心address配置为多个例如127.0.0.1:2181,127.0.0.2:2181,127.0.0.2:2181时

if strings.Contains(location, ":") {
			s.Ip, s.Port, err = net.SplitHostPort(location)
			if err != nil {
				return &s, perrors.Errorf("net.SplitHostPort(url.Host{%s}), error{%v}", s.Location, err)
			}
			break
		}

net.SplitHostPort(location) 方法解析会报错too many colons in address，所以url中的host和port取第一个即可

Provider starts metadata report error, and the error is {Start MetadataReport failed.: Invalid MetadataReportConfig.}

[codecov-commenter]

Codecov Report

Merging #1306 (18f344f) into 3.0 (968650f) will decrease coverage by 3.31%.
The diff coverage is 55.21%.

❗ Current head 18f344f differs from pull request most recent head a2f253e. Consider uploading reports for the commit a2f253e to get more accurate results

@@            Coverage Diff             @@
##              3.0    #1306      +/-   ##
==========================================
- Coverage   59.53%   56.22%   -3.32%     
==========================================
  Files         259      273      +14     
  Lines       12737    12781      +44     
==========================================
- Hits         7583     7186     -397     
- Misses       4199     4692     +493     
+ Partials      955      903      -52     

Impacted Files	Coverage Δ
cluster/cluster_impl/available_cluster_invoker.go	66.66% <ø> (ø)
cluster/cluster_impl/broadcast_cluster_invoker.go	76.47% <ø> (ø)
cluster/cluster_impl/failfast_cluster_invoker.go	66.66% <ø> (ø)
cluster/cluster_impl/mock_cluster.go	0.00% <0.00%> (ø)
cluster/loadbalance/random.go	100.00% <ø> (ø)
common/extension/auth.go	0.00% <ø> (ø)
common/extension/cluster.go	0.00% <ø> (ø)
common/extension/cluster_interceptor.go	0.00% <0.00%> (ø)
common/extension/config_center.go	0.00% <ø> (ø)
common/extension/config_center_factory.go	0.00% <ø> (ø)
... and 293 more

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