RFR: 8272317: jstatd has dependency on Security Manager which needs to be removed

[Kevin Walls]

Remove the use of Security Manager from jstatd.
Add use of an ObjectInputFilter to restrict RMI.

Also we can undo the property-setting Launcher.gmk change from: 8279007: jstatd fails to start because SecurityManager is disabled
..as that is no longer needed.

Docs/man page update to follow (JDK-8278619).

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Commit messages:
 - Remove jstad launcher property setting to allow Security Manager.
 - Merge remote-tracking branch 'upstream/master' into 8272317_jstatd_secmgr
 - Add ObjectInputFilter
 - Merge remote-tracking branch 'upstream/master' into 8272317_jstatd_secmgr
 - 8272317: jstatd has dependency on Security Manager which needs to be removed

Changes: https://git.openjdk.java.net/jdk/pull/6919/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6919&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272317
  Stats: 27 lines in 4 files changed: 4 ins; 15 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6919.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6919/head:pull/6919

PR: https://git.openjdk.java.net/jdk/pull/6919