Feature: Active Directory MSI Authentication support

[cheenamalhotra]

Introduces:

• Support for Azure AD MSI Authentication with:
  • System Assigned Managed Identity
  • User Assigned Managed Identity
• New Authentication Mode: "ActiveDirectoryMSI"
• New Connection Property:
  msiClientId: Accepts Client Id for "User Assigned Managed Identity" to retrieve Access Token

Fixes:

• Issues with Refresh Token creating new Connection every 15 mins

[codecov-io]

Codecov Report

Merging #838 into dev will decrease coverage by 0.32%.
The diff coverage is 9.25%.

@@             Coverage Diff              @@
##                dev     #838      +/-   ##
============================================
- Coverage     48.79%   48.46%   -0.33%     
+ Complexity     2824     2817       -7     
============================================
  Files           118      118              
  Lines         27877    28011     +134     
  Branches       4642     4673      +31     
============================================
- Hits          13602    13575      -27     
- Misses        12086    12248     +162     
+ Partials       2189     2188       -1

Flag	Coverage Δ	Complexity Δ
#JDBC42	47.99% <9.25%> (-0.34%)	2777 <8> (-6)
#JDBC43	48.33% <9.25%> (-0.36%)	2809 <8> (-9)

Impacted Files	Coverage Δ	Complexity Δ
...om/microsoft/sqlserver/jdbc/AuthenticationJNI.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	55.56% <ø> (-0.44%)	0 <0> (ø)
...om/microsoft/sqlserver/jdbc/SQLServerResource.java	100% <ø> (ø)	4 <0> (ø)	⬇️
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	61.12% <ø> (-0.3%)	89 <0> (-1)
.../com/microsoft/sqlserver/jdbc/SqlFedAuthToken.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../microsoft/sqlserver/jdbc/SQLServerDataSource.java	45.12% <0%> (-0.45%)	66 <0> (ø)
...microsoft/sqlserver/jdbc/SQLServerADAL4JUtils.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	46.3% <3.84%> (-1.8%)	335 <7> (ø)
...soft/sqlserver/jdbc/SQLServerPooledConnection.java	68.42% <50%> (+0.33%)	17 <1> (ø)	⬇️
.../com/microsoft/sqlserver/jdbc/SQLServerDriver.java	80.04% <75%> (-0.19%)	25 <0> (ø)
... and 13 more

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[peterbae]

Uploading the jre 8 jar created from this PR.

mssql-jdbc-msi-support-PR838.jre8.jar.zip