RFR: 8312444: Delete unused parameters and variables in SocketPermission [v3]

[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.

Korov has updated the pull request incrementally with one additional commit since the last revision:

  revert change

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18086/files
  - new: https://git.openjdk.org/jdk/pull/18086/files/9ebd6e12..e8c948a7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18086&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18086&range=01-02

  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 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