test statement.cancel() works when MultiSubnetFailover is set to true

[xiangyushawn]

for issue #144 and PR #160

[codecov-io]

Codecov Report

Merging #173 into dev will increase coverage by 0.2%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##               dev     #173     +/-   ##
==========================================
+ Coverage     29.7%   29.91%   +0.2%     
- Complexity    1248     1252      +4     
==========================================
  Files           97       97             
  Lines        23305    23305             
  Branches      3871     3871             
==========================================
+ Hits          6923     6971     +48     
+ Misses       15028    14960     -68     
- Partials      1354     1374     +20

Flag	Coverage Δ	Complexity Δ
#JDBC41	29.82% <ø> (+0.21%)	1249 <ø> (+4)	✅
#JDBC42	29.84% <ø> (+0.25%)	1251 <ø> (+7)	✅

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/microsoft/sql/DateTimeOffset.java	37.14% <0%> (-2.86%)	8% <0%> (-2%)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	17.61% <0%> (-0.33%)	127% <0%> (ø)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	45.81% <0%> (ø)	182% <0%> (ø)	❌
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	38.86% <0%> (+0.08%)	193% <0%> (+3%)	✅
...m/microsoft/sqlserver/jdbc/SQLServerStatement.java	53.4% <0%> (+0.5%)	108% <0%> (+1%)	✅
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	33.77% <0%> (+1.66%)	0% <0%> (ø)	❌
.../java/com/microsoft/sqlserver/jdbc/StreamDone.java	63.63% <0%> (+13.63%)	16% <0%> (+2%)	✅

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