fix SQLServerException wrapped by another SQLServerException

[xiangyushawn]

for issue #207

[codecov-io]

Codecov Report

Merging #213 into dev will increase coverage by 0.06%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev     #213      +/-   ##
============================================
+ Coverage     32.82%   32.88%   +0.06%     
- Complexity     1436     1442       +6     
============================================
  Files            97       97              
  Lines         23383    23385       +2     
  Branches       3889     3889              
============================================
+ Hits           7675     7691      +16     
+ Misses        14163    14151      -12     
+ Partials       1545     1543       -2

Flag	Coverage Δ	Complexity Δ
#JDBC41	32.69% <100%> (+0.03%)	1429 <0> (+3)	⬆️
#JDBC42	32.85% <100%> (+0.11%)	1442 <0> (+8)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...oft/sqlserver/jdbc/SQLServerParameterMetaData.java	20.13% <100%> (+0.35%)	27 <0> (ø)	⬇️
src/main/java/microsoft/sql/DateTimeOffset.java	37.14% <0%> (-2.86%)	8% <0%> (-2%)
...t/sqlserver/jdbc/SQLServerConnectionPoolProxy.java	12.62% <0%> (ø)	12% <0%> (ø)	⬇️
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	36.41% <0%> (+0.06%)	0% <0%> (ø)	⬇️
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	45.01% <0%> (+0.21%)	184% <0%> (+3%)	⬆️
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	24.33% <0%> (+0.44%)	175% <0%> (+5%)	⬆️

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[v-nisidh]

Approved.

[v-nisidh]

Just add one line comment like SQLServerException should not again wrapped by SQLServerException