Adding unit tests for WINRS

Test succeeds locally:
```
.\gradlew test -Dtest.single=CifsWinRsConnectionTest
The Test.testResultsDir property has been deprecated and is scheduled to be removed in Gradle 2.0. Please use the Test.getReports().getJunitXml().setDestination() property instead.
The Test.testReportDir property has been deprecated and is scheduled to be removed in Gradle 2.0. Please use the Test.getReports().getHtml().getDestination() property instead.
:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test

BUILD SUCCESSFUL
```