change xsd timeout from int to string

[alaneuler]

fix #544

[codecov-io]

Codecov Report

Merging #556 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #556      +/-   ##
============================================
+ Coverage     66.61%   66.64%   +0.02%     
  Complexity       91       91              
============================================
  Files           267      267              
  Lines          7657     7657              
  Branches       1092     1092              
============================================
+ Hits           5101     5103       +2     
+ Misses         1927     1926       -1     
+ Partials        629      628       -1

Impacted Files	Coverage Δ	Complexity Δ
...pc/boot/runtime/converter/RpcBindingConverter.java	60.88% <0%> (+0.73%)	0% <0%> (ø)	⬇️

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[caojie09]

LGTM