Fix:ENV DUBBO_IP_TO_REGISTRY doesn't work

[Code-Fight]

What this PR does:
fix DUBBO_IP_TO_REGISTRY doesn't work
Which issue(s) this PR fixes:
Fixes #
#2096

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• All ut passed (run 'go test ./...' in project root)
• After go-fmt ed , run 'go fmt project' using goland.
• Golangci-lint passed, run 'sudo golangci-lint run' in project root.
• Your new-created file needs to have apache license at the top, like other existed file does.
• All integration test passed. You can run integration test locally (with docker env). Clone our dubbo-go-samples project and replace the go.mod to your dubbo-go, and run 'sudo sh start_integration_test.sh' at root of samples project root. (M1 Slice is not Support)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #2138 (181b2f0) into 3.0 (d332f1b) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              3.0    #2138      +/-   ##
==========================================
- Coverage   44.44%   44.34%   -0.11%     
==========================================
  Files         283      283              
  Lines       17015    17016       +1     
==========================================
- Hits         7563     7545      -18     
- Misses       8658     8678      +20     
+ Partials      794      793       -1     

Impacted Files	Coverage Δ
...try/servicediscovery/service_discovery_registry.go	1.26% <0.00%> (-0.01%)	⬇️
metadata/report/delegate/delegate_report.go	26.49% <0.00%> (-8.61%)	⬇️
cluster/loadbalance/ringhash/ring.go	84.50% <0.00%> (-2.82%)	⬇️
metrics/prometheus/reporter.go	30.25% <0.00%> (-1.54%)	⬇️

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