RFR: 8312444: Unused parameter 'defval' in SocketPermission.initEphemeralPorts could be removed

[Korov]

Removing unused parameter `defval` in `SocketPermission.initEphemeralPorts`, so the variable `PRIV_PORT_MAX` and `DEF_EPH_LOW` unused too.

Removing unused parameter `cname` in `SocketPermission.authorizedIPv4` and `SocketPermission.authorizedIPv6`.

Parameter 'action' must be not empty so `a.length > 0`, the check `a.length - 1 < 0` can be removed.

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Commit messages:
 - 8312444: Unused parameter defval in SocketPermission.initEphemeralPorts could be removed
 - 8312444: Unused parameter defval in SocketPermission.initEphemeralPorts could be removed

Changes: https://git.openjdk.org/jdk/pull/18086/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18086&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312444
  Stats: 20 lines in 1 file changed: 0 ins; 9 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/18086.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18086/head:pull/18086

PR: https://git.openjdk.org/jdk/pull/18086