8334222: exclude containers/cgroup/PlainRead.java

Reviewed-by: lucy

Author: MBaesken

test/hotspot/jtreg/ProblemList.txt

@@ -104,6 +104,7 @@ runtime/cds/appcds/customLoader/HelloCustom_JFR.java 8241075 linux-all,windows-x
 
 applications/jcstress/copy.java 8229852 linux-all
 
+containers/cgroup/PlainRead.java 8333967,8261242 linux-all
 containers/docker/TestJcmd.java 8278102 linux-all
 containers/docker/TestMemoryAwareness.java 8303470 linux-all
 containers/docker/TestJFREvents.java 8327723 linux-x64