WIP: translate socket.timeout to TTransportException

[aisk]

So we can get better error message for which ip / port is called.

[aisk]

Seems the test cases are excepecting error socket.timeout, so this will be a breaking change?

[codecov[bot]]

Codecov Report

Merging #160 (efede5f) into master (108cca5) will decrease coverage by 0.28%. The diff coverage is 42.10%.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
- Coverage   83.35%   83.06%   -0.29%     
==========================================
  Files          43       43              
  Lines        3935     3951      +16     
==========================================
+ Hits         3280     3282       +2     
- Misses        655      669      +14     

Impacted Files	Coverage Δ
thriftpy2/transport/sslsocket.py	89.58% <ø> (ø)
thriftpy2/transport/socket.py	84.35% <41.17%> (-8.78%)	:arrow_down:
thriftpy2/rpc.py	81.94% <50.00%> (ø)

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