jdk/test/ProblemList.txt needs to be updated to list tests that we've seen fail intermittently recently. These include:

# 7079093
java/lang/instrument/ManifestTest.sh windows-all

# 6944188
java/lang/management/ThreadMXBean/ThreadStateTest.java generic-all

# 7079012
java/net/NetworkInterface/NetParamsTest.java solaris-all

# 7081476
java/net/InetSocketAddress/B6469803.java generic-all

# 6671616
java/io/File/BlockIsDirectory.java solaris-all

# 7076644
java/io/File/Basic.java windows-all

# 7076700
java/nio/channels/SocketChannel/AdaptSocket.java generic-all

# ClassCastException: java.lang.String cannot be cast to java.security.cert.Certificate
sun/security/provider/certpath/X509CertPath/IllegalCertiticates.java generic-all