Added cancelQueryTimeout to cancel QueryTimeout on Connection and Statement

[cheenamalhotra]

Extension of PR #560.

Adds new property cancelQueryTimeout on both Connection and Statement classes. The Connection level property is used by all statements by default, while setting it at Statement level overrides the connection property.

The fix will address issue #525 where queryTimeout hangs and does not throw exception due to silent dropping of TCP connection.

The driver now reads timeout values from statement being executed and not connection (Changed from #560 initial implementation) and shall wait the total amount of cancelQueryTimeout + queryTimeout to drop the connection and close the channel.

Note: The new connection property of cancelQueryTimeout will be effective only if the queryTimeout is set in the driver.

[codecov-io]

Codecov Report

Merging #674 into dev will decrease coverage by 0.04%.
The diff coverage is 59.72%.

@@             Coverage Diff              @@
##                dev     #674      +/-   ##
============================================
- Coverage     48.22%   48.18%   -0.05%     
+ Complexity     2579     2578       -1     
============================================
  Files           113      113              
  Lines         26569    26626      +57     
  Branches       4438     4449      +11     
============================================
+ Hits          12813    12829      +16     
- Misses        11619    11656      +37     
- Partials       2137     2141       +4

Flag	Coverage Δ	Complexity Δ
#JDBC42	48.07% <59.72%> (-0.05%)	2574 <4> (+1)
#JDBC43	48.04% <59.72%> (-0.08%)	2568 <4> (-4)

Impacted Files	Coverage Δ	Complexity Δ
...om/microsoft/sqlserver/jdbc/SQLServerResource.java	100% <ø> (ø)	4 <0> (ø)	⬇️
.../microsoft/sqlserver/jdbc/SQLServerDataSource.java	45.19% <0%> (-0.48%)	66 <0> (ø)
.../com/microsoft/sqlserver/jdbc/SQLServerDriver.java	76.98% <100%> (+0.12%)	25 <0> (ø)	⬇️
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java	50.85% <100%> (ø)	157 <0> (ø)	⬇️
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.67% <100%> (+0.12%)	240 <0> (+1)	⬆️
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	45.79% <40%> (-0.04%)	289 <1> (+2)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	33.14% <50%> (ø)	245 <0> (ø)	⬇️
...m/microsoft/sqlserver/jdbc/SQLServerStatement.java	59.44% <60%> (-0.18%)	134 <3> (+2)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	55.16% <75%> (+0.16%)	0 <0> (ø)	⬇️
...m/microsoft/sqlserver/jdbc/SQLServerException.java	75.6% <0%> (-1.63%)	29% <0%> (-1%)
... and 9 more

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[cheenamalhotra]

Hi @ulvii - made recommended fixes. Please review once more.

Thanks!