refactor(generic_filter): struct2MapAll key of map keep type of int f…

[ljun20160606]

…loat string

What this PR does:

Which issue(s) this PR fixes:

Fixes #865

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #928 (e3c5cf3) into develop (1156b92) will increase coverage by 0.14%.
The diff coverage is 75.00%.

@@             Coverage Diff             @@
##           develop     #928      +/-   ##
===========================================
+ Coverage    59.83%   59.97%   +0.14%     
===========================================
  Files          260      260              
  Lines        12854    12861       +7     
===========================================
+ Hits          7691     7714      +23     
+ Misses        4202     4184      -18     
- Partials       961      963       +2     

Impacted Files	Coverage Δ
filter/filter_impl/generic_filter.go	71.21% <75.00%> (-0.92%)	⬇️
metadata/definition/mock.go	0.00% <0.00%> (-25.00%)	⬇️
remoting/getty/pool.go	68.72% <0.00%> (-0.89%)	⬇️
protocol/grpc/grpc_exporter.go	100.00% <0.00%> (ø)
protocol/rest/rest_exporter.go	100.00% <0.00%> (ø)
protocol/dubbo/dubbo_exporter.go	100.00% <0.00%> (ø)
protocol/jsonrpc/jsonrpc_exporter.go	100.00% <0.00%> (ø)
filter/filter_impl/generic_service_filter.go	67.30% <0.00%> (ø)
cluster/router/healthcheck/default_health_check.go	94.11% <0.00%> (ø)
common/rpc_service.go	88.11% <0.00%> (+0.16%)	⬆️
... and 4 more

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[cityiron]

pls change your target branch to develop.

[ljun20160606]

pls change your target branch to develop.

Done