HBASE-23793 Increase maven heap allocation to 4G in Yetus personality (#1122)

I saw this over on
https://builds.apache.org/view/H-L/view/HBase/job/HBase%20Nightly/job/branch-2/2447/console. Looks
like we need to bump the memory allocation for maven. I wonder if this
is the underlying cause of HBASE-22470.

```
6:38:47  ============================================================================
16:38:47  ============================================================================
16:38:47                                Finished build.
16:38:47  ============================================================================
16:38:47  ============================================================================
16:38:47
16:38:47
Post stage
[Pipeline] stash
16:38:48  Warning: overwriting stash 'hadoop2-result'
16:38:48  Stashed 1 file(s)
[Pipeline] junit
16:38:48  Recording test results
16:38:54  Remote call on H2 failed
Error when executing always post condition:
java.io.IOException: Remote call on H2 failed
	at hudson.remoting.Channel.call(Channel.java:963)
	at hudson.FilePath.act(FilePath.java:1072)
	at hudson.FilePath.act(FilePath.java:1061)
	at hudson.tasks.junit.JUnitParser.parseResult(JUnitParser.java:114)
	at hudson.tasks.junit.JUnitResultArchiver.parse(JUnitResultArchiver.java:137)
	at hudson.tasks.junit.JUnitResultArchiver.parseAndAttach(JUnitResultArchiver.java:167)
	at hudson.tasks.junit.pipeline.JUnitResultsStepExecution.run(JUnitResultsStepExecution.java:52)
	at hudson.tasks.junit.pipeline.JUnitResultsStepExecution.run(JUnitResultsStepExecution.java:25)
	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.OutOfMemoryError: Java heap space
	at com.sun.org.apache.xerces.internal.util.XMLStringBuffer.append(XMLStringBuffer.java:208)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.scanData(XMLEntityScanner.java:1515)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanCDATASection(XMLDocumentFragmentScannerImpl.java:1654)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3014)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
	at org.dom4j.io.SAXReader.read(SAXReader.java:465)
	at org.dom4j.io.SAXReader.read(SAXReader.java:343)
	at hudson.tasks.junit.SuiteResult.parse(SuiteResult.java:178)
	at hudson.tasks.junit.TestResult.parse(TestResult.java:348)
	at hudson.tasks.junit.TestResult.parsePossiblyEmpty(TestResult.java:281)
	at hudson.tasks.junit.TestResult.parse(TestResult.java:206)
	at hudson.tasks.junit.TestResult.parse(TestResult.java:178)
	at hudson.tasks.junit.TestResult.<init>(TestResult.java:143)
	at hudson.tasks.junit.JUnitParser$ParseResultCallable.invoke(JUnitParser.java:146)
	at hudson.tasks.junit.JUnitParser$ParseResultCallable.invoke(JUnitParser.java:118)
	at hudson.FilePath$FileCallableWrapper.call(FilePath.java:3052)
	at hudson.remoting.UserRequest.perform(UserRequest.java:212)
	at hudson.remoting.UserRequest.perform(UserRequest.java:54)
	at hudson.remoting.Request$2.run(Request.java:369)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
	... 4 more

[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
[Pipeline] // node
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
16:38:54  Failed in branch yetus jdk8 hadoop2 checks
```

Signed-off-by: stack <stack@apache.org>

dev-support/hbase-personality.sh

@@ -80,7 +80,7 @@ function personality_globals
   # TODO use PATCH_BRANCH to select jdk versions to use.
 
   # Override the maven options
-  MAVEN_OPTS="${MAVEN_OPTS:-"-Xmx3100M"}"
+  MAVEN_OPTS="${MAVEN_OPTS:-"-Xms4G -Xmx4G"}"
 
   # Yetus 0.7.0 enforces limits. Default proclimit is 1000.
   # Up it. See HBASE-19902 for how we arrived at this number.