hg: code-tools/jtreg: fix warnings; adopt -Xlint -Werror

[jonathan.gibbons at oracle.com]

Changeset: 96b54b07b60d
Author:    jjg
Date:      2016-05-04 18:41 -0700
URL:       http://hg.openjdk.java.net/code-tools/jtreg/rev/96b54b07b60d

fix warnings; adopt -Xlint -Werror

! make/jtdiff.gmk
! make/jtreg.gmk
! make/tests/Basic.gmk
! make/tests/BuildPatternTest.gmk
! make/tests/CPAppendTests.gmk
! make/tests/CompileArgFileTest.gmk
! make/tests/JDKOptsTest.gmk
! make/tests/OSTest.gmk
! make/tests/RerunTest2.gmk
! make/tests/StatsTests.gmk
! make/tests/T4499340.gmk
! make/tests/TestRetainTest.gmk
! make/tests/TimeoutHandlerTimeoutTest.gmk
! make/tests/jcov.gmk
! src/share/classes/com/sun/javatest/regtest/GroupManager.java
! src/share/classes/com/sun/javatest/regtest/JUnitAction.java
! src/share/classes/com/sun/javatest/regtest/ProcessCommand.java
! src/share/classes/com/sun/javatest/regtest/RegressionKeywords.java
! src/share/classes/com/sun/javatest/regtest/RegressionReporter.java
! src/share/classes/com/sun/javatest/regtest/TestManager.java
! src/share/classes/com/sun/javatest/regtest/TimeoutHandlerProvider.java
! src/share/classes/com/sun/javatest/regtest/agent/AppletWrapper.java
! src/share/classes/java/lang/reflect/JTRegModuleHelper.java
! src/share/test/javatest/regtest/Basic.java
! src/share/test/javatest/regtest/RetainTest.java