RFR: 8257858: [macOS]: Remove JNF dependency from libosxsecurity/KeystoreImpl.m [v6]

[Weijun Wang]

> This fix covers both
> 
> - [[macOS]: Remove JNF dependency from libosxsecurity/KeystoreImpl.m](https://bugs.openjdk.java.net/browse/JDK-8257858)
> - [[macOS]: Remove JNF dependency from libosxkrb5/SCDynamicStoreConfig.m](https://bugs.openjdk.java.net/browse/JDK-8257860)

Weijun Wang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 15 additional commits since the last revision:

 - move test
 - Merge branch 'master' into 8257858
 - a test
   
   only in patch2:
   unchanged:
 - end values should be vectors
 - phil comment
 - same behavior as before -- empty realm map
 - error check, new JavaStringToNSString
 - do not find class and method in loop
 - no more header file
   
   reverted:
 - better macro, no more JNI_COCOA_ENTER
 - ... and 5 more: https://git.openjdk.java.net/jdk/compare/bb728c47...ef337f12

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1845/files
  - new: https://git.openjdk.java.net/jdk/pull/1845/files/38616b32..ef337f12

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1845&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1845&range=04-05

  Stats: 33763 lines in 708 files changed: 13479 ins; 10043 del; 10241 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1845.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1845/head:pull/1845

PR: https://git.openjdk.java.net/jdk/pull/1845