Fix: fix revision calc

[ray2011]

What this PR does:
fix different revision calc in service_revision_customizer.go:resolveRevision and metadata_info.go:(*MetadataInfo).CalcAndGetRevision, which make client get empty server metadata.

Which issue(s) this PR fixes:
Fixes #1925

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[codecov-commenter]

Codecov Report

Merging #1926 (ce18570) into 3.0 (07defad) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              3.0    #1926      +/-   ##
==========================================
- Coverage   45.02%   44.93%   -0.09%     
==========================================
  Files         287      287              
  Lines       17135    17135              
==========================================
- Hits         7715     7700      -15     
- Misses       8606     8622      +16     
+ Partials      814      813       -1     

Impacted Files	Coverage Δ
common/metadata_info.go	0.00% <0.00%> (ø)
filter/metrics/filter.go	85.00% <0.00%> (-15.00%)	⬇️
metadata/report/delegate/delegate_report.go	26.49% <0.00%> (-7.95%)	⬇️
...tocol/rest/server/server_impl/go_restful_server.go	41.37% <0.00%> (-3.45%)	⬇️
cluster/loadbalance/ringhash/ring.go	87.32% <0.00%> (+2.81%)	⬆️

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