Added jtreg-buffer testsuite

based on:
adoptium#5195
adoptium#5167

functional/jtreg-buffer/README.md

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+# Jtreg-buffer Tests
+
+jtreg-buffer are tests, which ideally should end in OpenJDK regression test repositories.
+These tests are pulled from the https://github.com/rh-openjdk/jtreg-buffer repository.

functional/jtreg-buffer/build.xml

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+<?xml version="1.0"?>
+
+<!--
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+-->
+
+<project name="jtreg-buffer" default="build" basedir=".">
+	<taskdef resource="net/sf/antcontrib/antlib.xml" />
+	<description>
+		Set of tests, running not yet upstreamed jtreg tests, or jtreg tests which were not accepted for some reason, and still have reason to keep.
+	</description>
+
+	<!-- set properties for this build -->
+	<property name="TEST" value="jtreg-buffer" />
+	<property name="DEST" value="${BUILD_ROOT}/functional/jtreg-buffer" />
+	<property name="src" location="./jtreg-buffer" />
+
+	<target name="jtreg-buffer.check">
+		<condition property="jtreg-buffer.exists">
+			<available file="jtreg-buffer" type="dir"/>
+		</condition>
+	</target>
+
+	<if>
+		<contains string="${SPEC}" substring="zos"/>
+		<then>
+			<property name="GIT_REPO" value="git@github.com:" />
+		</then>
+		<else>
+			<property name="GIT_REPO" value="https://github.com/" />
+		</else>
+	</if>
+	<target name="getJtreg-buffer" depends="jtreg-buffer.check" unless="jtreg-buffer.exists">
+		<getFileWithRetry file="jtreg-buffer" command="git clone --depth 1 -q ${GIT_REPO}rh-openjdk/jtreg-buffer.git -b main jtreg-buffer"/>
+		<checkGitRepoSha repoDir="jtreg-buffer"/>
+	</target>
+
+	<target name="init">
+		<mkdir dir="${DEST}"/>
+        </target>
+
+	<import file="${TEST_ROOT}/TKG/scripts/getDependencies.xml"/>
+
+
+	<target name="dist" depends="getJtreg-buffer" description="generate the distribution">
+		<copy todir="${DEST}">
+			<fileset dir="${src}" includes="*.xml,*.mk"/>
+		</copy>
+	</target>
+
+	<target name="clean" depends="dist" description="clean up">
+		<!-- Delete the ${build} directory trees -->
+		<delete dir="${build}" />
+	</target>
+
+	<target name="build" >
+		<antcall target="clean" inheritall="true" />
+	</target>
+</project>

functional/jtreg-buffer/playlist.xml

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+<?xml version='1.0' encoding='UTF-8'?>
+<!--
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+-->
+<playlist xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../TKG/resources/playlist.xsd">
+	<test>
+		<testCaseName>jtreg-buffer</testCaseName>
+		<disables>
+			<disable>
+                <comment>readlink -f is known to misbehave on selected platforms</comment>
+				<platform>^.*(s390x_linux|aarch64_mac).*$</platform>
+			</disable>
+		</disables>
+		<command>
+			JTREG_HOME="$(TEST_RESROOT)$(D)jtreg" \
+			$(TEST_ROOT)$(D)functional$(D)jtreg-buffer$(D)jtreg-buffer$(D)run.sh "$(TEST_JDK_HOME)" ; $(TEST_STATUS)
+		</command>
+		<levels>
+			<level>dev</level>
+		</levels>
+		<groups>
+			<group>functional</group>
+		</groups>
+	</test>
+	<test>
+		<testCaseName>jtreg-buffer_jtreg</testCaseName>
+		<disables>
+			<disable>
+                <comment>readlink -f is known to misbehave on selected platforms</comment>
+				<platform>^((?!(s390x_linux|aarch64_mac)).)*$</platform>
+			</disable>
+		</disables>
+		<command>$(JAVA_COMMAND) -Xmx512m -jar $(Q)$(TEST_RESROOT)$(D)jtreg$(D)lib$(D)jtreg.jar$(Q) \
+		-xml -v1 -a -ignore:quiet  -timeoutFactor:2 \
+		-w $(Q)$(REPORTDIR)$(D)work$(Q) \
+		-r $(Q)$(REPORTDIR)$(D)report$(Q) \
+		-jdk:$(Q)$(TEST_JDK_HOME)$(Q) \
+		$(Q)$(TEST_ROOT)$(D)functional$(D)jtreg-buffer$(D)jtreg-buffer$(Q); \
+		$(TEST_STATUS)
+                </command>
+		<levels>
+			<level>dev</level>
+		</levels>
+		<groups>
+			<group>functional</group>
+		</groups>
+	</test>
+</playlist>