RFR: 8267485: Remove the dependency on SecurityManager in JceSecurityManager.java [v6]

[Bradford Wetmore]

> The JceSecurityManager is currently a subclass of java.security.SecurityManager.  Now that JEP 411 has been integrated, this class should be updated to no longer subclass SecurityManager.
> 
> The only reason for using SecurityManager to easily get the Class Context (call stack), but we can achieve the same effect by using the JDK 9 API java.lang.StackWalkeer.  None of the other SecurityManager API are used.
> 
> I have run mach5 tier1/tier2 plus --test jck:api/java_security,jck:api/javax_crypto,jck:api/javax_net,jck:api/javax_security,jck:api/org_ietf,jck:api/javax_xml/crypto with all green.

Bradford Wetmore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 22 commits:

 - More codereview comments
 - Merge branch 'master' into JDK-8267485
 - Merge branch 'master' into JDK-8267485
 - Merge branch 'master' into JDK-8267485
 - Merge branch 'master' into JDK-8267485
 - Merge branch 'master' into JDK-8267485
 - Switching tasks
 - Merge branch 'master' into JDK-8267485
 - More Codereview Comments
 - Merge branch 'master' into JDK-8267485
 - ... and 12 more: https://git.openjdk.java.net/jdk/compare/efa63dc1...2ee40c1e

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Changes: https://git.openjdk.java.net/jdk/pull/4150/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4150&range=05
  Stats: 53 lines in 2 files changed: 11 ins; 11 del; 31 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4150.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4150/head:pull/4150

PR: https://git.openjdk.java.net/jdk/pull/4150