RFR: 8295984: Remove unexpected JShell feature

[Jan Lahoda]

This patch patches JShell to not have the ability to run URL specified on the command line. Please also review the CSR: https://bugs.openjdk.org/browse/JDK-8296326

Thanks!

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Commit messages:
 - 8295984: Remove unexpected JShell feature

Changes: https://git.openjdk.org/jdk/pull/10979/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10979&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295984
  Stats: 30 lines in 4 files changed: 22 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/10979.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10979/head:pull/10979

PR: https://git.openjdk.org/jdk/pull/10979