RFR: JDK-8293343 sun/management/jmxremote/bootstrap/RmiSslNoKeyStoreTest.java failed with "Agent communication error: java.io.EOFException"

[Bill Huang]

This task provides a fix for java.io.EOFException on RmiSslNoKeyStoreTest and RmiBootstrapTest.

The EOFException is only seen when tests are run in concurrent mode. It could be caused by a bug in prepareTestFiles() which creates a race condition that RmiBootstrapTest/RmiSslNoKeyStoreTest changes the file permissions while the other one reading the same files. 

In addition, tests are failing intermittently for SocketException with agentvm mode.

-------------

Commit messages:
 - Removed RmiBootstrapTest and RmiSslNoKeyStoreTest from ProblemList.
 - Made tests run in othervm mode.
 - Fixed prepareTestFile() to return property files in the test folder.

Changes: https://git.openjdk.org/jdk/pull/10224/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10224&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293343
  Stats: 6 lines in 4 files changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/10224.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10224/head:pull/10224

PR: https://git.openjdk.org/jdk/pull/10224