RFR: 8339347: keytool -importpass insists prompting the user even if there is no terminal

[Hai-May Chao]

Given the changes to the System.console() behavior, where it no longer returns null when a write pipe is connected to the Java process, keytool needs to be updated to determine whether an interactive terminal is attached.

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Commit messages:
 - 8339347: keytool -importpass insists prompting the user even if there is no terminal
 - 8339347: keytool -importpass insists prompting the user even if there is no terminal

Changes: https://git.openjdk.org/jdk/pull/20855/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20855&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339347
  Stats: 51 lines in 2 files changed: 49 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20855.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20855/head:pull/20855

PR: https://git.openjdk.org/jdk/pull/20855