RFR: 8274656: Remove default_checksum and safe_checksum_type from krb5.conf [v3]

[Weijun Wang]

> Remove support for the 2 settings. Remove classes around the KRB_PRIV and KRB_SAFE message types that were never used in Java.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  clean up comment

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5788/files
  - new: https://git.openjdk.java.net/jdk/pull/5788/files/83b94920..1a975f92

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5788&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5788&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5788.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5788/head:pull/5788

PR: https://git.openjdk.java.net/jdk/pull/5788