Summary
-------

Remove `jdk.net.ExtendedSocketOptions.SO_FLOW_SLA`, `SocketFlow` and `SocketFlow.Status`. The Solaris and JDK-specific `SO_FLOW_SLA` socket option was terminally deprecated in JDK 14 (JDK-8235194) in preparation for the removal of the Solaris port. JEP 381 has already removed the implementation from JDK 15. The API elements (socket option and supporting classes) can now be removed. 


Problem
-------

The specification for `ExtendedSocketOptions.SO_FLOW_SLA` will need to be removed along with the option itself. 

The class level API documentation of `NetworkPermission` describes the permission targets required to get and set the `ExtendedSocketOptions.SO_FLOW_SLA` option. The description also currently marks these permission targets as being deprecated. The description of the permission targets will need to be removed from the class level API documentation of `NetworkPermission`. 

Solution
--------

Remove all related specification for `ExtendedSocketOptions.SO_FLOW_SLA`. 

Specification
-------------

Remove `jdk.net.ExtendedSocketOption.SO_FLOW_SLA`

Remove `jdk.net.SocketFlow`

Remove `jdk.net.SocketFlow.Status`

Remove the list of targets from `jdk.net.NetworkPermission`

         /**
          * Represents permission to access the extended networking capabilities
          * defined in the jdk.net package. These permissions contain a target
          * name, but no actions list. Callers either possess the permission or not.
    -     * <p>
    -     * The following targets are defined:
    -     *
    -     * <table class="striped"><caption style="display:none">permission target name,
    -     *  what the target allows,and associated risks</caption>
    -     * <thead>
    -     * <tr>
    -     *   <th scope="col">Permission Target Name</th>
    -     *   <th scope="col">What the Permission Allows</th>
    -     *   <th scope="col">Risks of Allowing this Permission</th>
    -     * </tr>
    -     * </thead>
    -     * <tbody>
    -     * <tr>
    -     *   <th scope="row">setOption.SO_FLOW_SLA</th>
    -     *   <td>set the {@link ExtendedSocketOptions#SO_FLOW_SLA SO_FLOW_SLA} option
    -     *       on any socket that supports it</td>
    -     *   <td>allows caller to set a higher priority or bandwidth allocation
    -     *       to sockets it creates, than they might otherwise be allowed.
    -     *       This permission is deprecated.</td>
    -     * </tr>
    -     * <tr>
    -     *   <th scope="row">getOption.SO_FLOW_SLA</th>
    -     *   <td>retrieve the {@link ExtendedSocketOptions#SO_FLOW_SLA SO_FLOW_SLA}
    -     *       setting from any socket that supports the option</td>
    -     *   <td>allows caller access to SLA information that it might not
    -     *       otherwise have. This permission is deprecated.</td>
    -     * </tr>
    -     * </tbody>
    -     * </table>
          *
          * @see jdk.net.ExtendedSocketOptions
          *
          * @since 1.8
          */
    
         public final class NetworkPermission extends BasicPermission {