add socket timeout exception as cause

[xiangyushawn]

for issue #139

[codecov-io]

Codecov Report

Merging #180 into dev will increase coverage by 0.03%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##                dev    #180      +/-   ##
===========================================
+ Coverage     31.36%   31.4%   +0.03%     
- Complexity     1351    1353       +2     
===========================================
  Files            97      97              
  Lines         23307   23307              
  Branches       3872    3872              
===========================================
+ Hits           7310    7319       +9     
+ Misses        14577   14569       -8     
+ Partials       1420    1419       -1

Flag	Coverage Δ	Complexity Δ
#JDBC41	31.29% <0%> (+0.03%)	1348 <0> (+3)	✅
#JDBC42	31.28% <0%> (+0.04%)	1346 <0> (+1)	✅

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	34.88% <0%> (ø)	0 <0> (ø)	❌
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	21.32% <0%> (+0.08%)	157% <0%> (+1%)	✅
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	45.16% <0%> (+0.21%)	183% <0%> (ø)	❌
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	24.1% <0%> (+0.44%)	36% <0%> (ø)	❌
...om/microsoft/sqlserver/jdbc/SimpleInputStream.java	39.7% <0%> (+1.47%)	10% <0%> (+1%)	✅

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