RFR: 8267485: Remove the dependency on SecurityManager in JceSecurityManager.java [v8]

[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 incrementally with one additional commit since the last revision:

  More codereview comments

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4150/files
  - new: https://git.openjdk.java.net/jdk/pull/4150/files/65f4a2e2..40b0de09

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4150&range=07
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4150&range=06-07

  Stats: 8 lines in 1 file changed: 3 ins; 2 del; 3 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