RFR: 8269034: AccessControlException for SunPKCS11 daemon threads

[Sean Coffey]

Sufficient permissions missing if this code was ever to run with SecurityManager. 

Cleanest approach appears to be use of InnocuousThread to create the cleaner/poller threads.
Test case coverage extended to cover the SecurityManager scenario.

Reviewer request: @valeriepeng

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Commit messages:
 - 8269034: AccessControlException for SunPKCS11 daemon threads

Changes: https://git.openjdk.java.net/jdk/pull/4555/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4555&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269034
  Stats: 112 lines in 5 files changed: 73 ins; 17 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4555.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4555/head:pull/4555

PR: https://git.openjdk.java.net/jdk/pull/4555