support http2 (#278)

[Sophie-Xie]

pick #278

[codecov-commenter]

Codecov Report

Patch coverage: 37.50% and project coverage change: -0.64% ⚠️

Comparison is base (71a8713) 62.12% compared to head (278925f) 61.48%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
- Coverage   62.12%   61.48%   -0.64%     
==========================================
  Files           9        9              
  Lines        2305     2342      +37     
==========================================
+ Hits         1432     1440       +8     
- Misses        734      762      +28     
- Partials      139      140       +1     

Files Changed	Coverage Δ
configs.go	38.73% <20.00%> (-0.69%)	⬇️
connection.go	55.81% <34.04%> (-11.54%)	⬇️
session_pool.go	61.07% <50.00%> (+0.11%)	⬆️
connection_pool.go	81.46% <62.50%> (ø)

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[Sophie-Xie]

hold, need to modify thrift.

[veezhang]

sed -i 's,github.com/facebook/fbthrift,github.com/vesoft-inc/fbthrift,g' `grep -rl github.com/facebook/fbthrift .`