Update Gradle Script for building JDBC Driver

[cheenamalhotra]

Gradle Script updated with full support of building driver (jre8 and jre9 version)

[codecov-io]

Codecov Report

Merging #689 into dev will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                dev    #689      +/-   ##
===========================================
+ Coverage     48.05%   48.1%   +0.05%     
- Complexity     2583    2586       +3     
===========================================
  Files           114     114              
  Lines         26578   26578              
  Branches       4453    4453              
===========================================
+ Hits          12772   12786      +14     
+ Misses        11671   11650      -21     
- Partials       2135    2142       +7

Flag	Coverage Δ	Complexity Δ
#JDBC42	48% <ø> (+0.02%)	2580 <ø> (+2)	⬆️
#JDBC43	47.94% <ø> (+0.02%)	2578 <ø> (+2)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	63.05% <0%> (-0.24%)	0% <0%> (ø)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.42% <0%> (-0.13%)	239% <0%> (-1%)
...m/microsoft/sqlserver/jdbc/SQLServerStatement.java	59.44% <0%> (-0.1%)	134% <0%> (-1%)
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	45.41% <0%> (ø)	107% <0%> (-1%)	⬇️
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	54.9% <0%> (+0.19%)	0% <0%> (ø)	⬇️
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	33.21% <0%> (+0.19%)	245% <0%> (+1%)	⬆️
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	39.18% <0%> (+0.64%)	43% <0%> (+1%)	⬆️
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	62% <0%> (+0.65%)	90% <0%> (+1%)	⬆️
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	47.19% <0%> (+4.49%)	17% <0%> (+3%)	⬆️

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