RFR: JDK-8322062: com/sun/jdi/JdwpAllowTest.java does not performs negative testing with prefix length

[Alex Menkov]

The fix updated JdwpAllowTest to test negative scenarios (debugger tries to attach from not allowed address).

MaskTest ctor incorrectly calculates prefix length for negative tests and test main() calls `positiveTest` instead of `negativeTest` for `prefixLengthBad`.

Also fixes test output:
LingeredApp logs to System.out and the test logs to System.err, this makes harder log analysis.

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Commit messages:
 - Update JdwpAllowTest.java

Changes: https://git.openjdk.org/jdk/pull/17131/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17131&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322062
  Stats: 26 lines in 1 file changed: 8 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/17131.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17131/head:pull/17131

PR: https://git.openjdk.org/jdk/pull/17131