RFR: 8344190: Cleanup code in sun.net.www.protocol.http and sun.net.www.protocol.https after JEP 486 integration

[Jaikiran Pai]

Can I please get a review of this code which cleans up usages of SecurityManager and related APIs? This addresses https://bugs.openjdk.org/browse/JDK-8344190.

No new tests have been added and testing of tier1, tier2, tier3 is in progress.

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Commit messages:
 - clean up sun.net.www.protocol.https after removal of SecurityManager implementation
 - clean up sun.net.www.protocol.http after removal of SecurityManager implementation

Changes: https://git.openjdk.org/jdk/pull/22232/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22232&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344190
  Stats: 625 lines in 8 files changed: 3 ins; 506 del; 116 mod
  Patch: https://git.openjdk.org/jdk/pull/22232.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22232/head:pull/22232

PR: https://git.openjdk.org/jdk/pull/22232