RFR: JDK-8217638 Remove old way of running tests (test/Makefile)

Wed Jan 23 13:43:37 UTC 2019

The new RunTest method has been used by both developers and CI systems 
for quite some time. In <a href="/browse/JDK-8210958" title="Rename 
"make run-test" to "make test"" class="issue-link" 
data-issue-key="JDK-8210958"><strike>JDK-8210958</strike></a>, the old 
method was deprecated and a warning was printed to stop using it. Now 
the time has come to finally remove the old cruft.

Bug: https://bugs.openjdk.java.net/browse/JDK-8217638

The webrev or hg diff would not make much sense, here's a "hg status" of 
the removed files instead:

$ hg status
R test/Makefile
R test/TestCommon.gmk
R test/hotspot/jtreg/Makefile
R test/jaxp/Makefile
R test/jdk/Makefile
R test/nashorn/Makefile

/Magnus