Fix issue with setAutoCommit leaving a transaction behind in Azure DW

[peterbae]

Fixed issue #872.

Currently, when we call setAutoCommit(), we execute this query:

IF @@TRANCOUNT > 0 COMMIT TRAN set implicit_transactions off 

This still leaves a transaction open in Azure DW, according to MSDN documents.

To fix this issue, we're going to execute this query instead:

set implicit_transactions off IF @@TRANCOUNT > 0 COMMIT TRAN 

Which should do the same thing except it fixes the aforementioned issue in Azure DW.

[codecov-io]

Codecov Report

Merging #881 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev     #881      +/-   ##
============================================
+ Coverage     48.71%   48.71%   +<.01%     
- Complexity     2797     2801       +4     
============================================
  Files           116      116              
  Lines         27877    27877              
  Branches       4650     4650              
============================================
+ Hits          13579    13581       +2     
- Misses        12093    12094       +1     
+ Partials       2205     2202       -3

Flag	Coverage Δ	Complexity Δ
#JDBC42	48.25% <100%> (+0.03%)	2759 <0> (+3)	⬆️
#JDBC43	48.62% <100%> (+0.03%)	2794 <0> (+6)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	48.09% <100%> (ø)	335 <0> (ø)	⬇️
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	43.95% <0%> (-3.3%)	15% <0%> (ø)
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	44.42% <0%> (-1.32%)	106% <0%> (-2%)
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	62.45% <0%> (-0.06%)	0% <0%> (ø)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	56.24% <0%> (-0.04%)	0% <0%> (ø)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	33.11% <0%> (+0.34%)	260% <0%> (+4%)	⬆️
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	61.42% <0%> (+0.43%)	90% <0%> (+1%)	⬆️
...a/com/microsoft/sqlserver/jdbc/PLPInputStream.java	59.52% <0%> (+1.19%)	34% <0%> (+1%)	⬆️

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