The testng keyword not applied to tests with "@run testng" action.
Checking the output of some jtreg self-tests...


$ more work/std/TestNGTest.jtr
#Test Results (version 2)
#Mon Feb 13 11:31:03 PST 2017
#-----testdescription-----
$file=/w/jjg/work/jtreg/jtreg.dev/src/share/test/javatest/regtest/data/rerun/std/TestNGTest.java
$root=/w/jjg/work/jtreg/jtreg.dev/src/share/test/javatest/regtest/data/rerun
keywords=
run=USER_SPECIFIED testng TestNGTest\n
source=TestNGTest.java
title=\

$ more work/testng/TestNGTest.jtr
#Test Results (version 2)
#Mon Feb 13 11:31:04 PST 2017
#-----testdescription-----
$file=/w/jjg/work/jtreg/jtreg.dev/src/share/test/javatest/regtest/data/rerun/testng/TestNGTest.java
$root=/w/jjg/work/jtreg/jtreg.dev/src/share/test/javatest/regtest/data/rerun
keywords=testng
packageRoot=testng/
run=ASSUMED_ACTION testng TestNGTest\n
source=TestNGTest.java
testngClass=TestNGTest
title=\