Summary
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Drop support for `java.net.SocketImpl` implementations written prior to Java 1.4 which do not have the abstract timed `connect` method added in Java 1.4. There is no evidence that any such implementations still exist. Such implementations, if there are any, will not even compile with Java 1.4, or greater.

Problem
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We wish to resolve technical debt associated with java.net Socket/ServerSocket in a few different areas. In this case, there is code which attempts to allow the `public void connect(SocketAddress endpoint, int timeout)` to operate in a limited fashion with SocketImpls that do not support the corresponding method. `java.net.Socket` currently uses reflection to check if the `SocketImpl` provided has implemented the timed `connect` method, and if it doesn't, then it is able to emulate the timed connect in the fully blocking case only. For other timed connects, UOE is thrown.

Solution
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The solution is simply to remove the check for old impls, and the special casing that results from when an old impl is found.

Specification
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This is binary incompatible insofar as a `SocketImpl` compiled with Java 1.3, or earlier, and which does not have an implementation of the `public abstract void connect(SocketAddress,int)` method ( introduced in Java 1.4 ), would function in some limited way with later releases, but now will not function at all.
This is a behavior change only. There is no specification change.

We wish to also make a small non normative change to apidoc. The existing (undocumented) no-arg constructor for java.net.SocketImpl will have the following text added:
 

       /**
         * Initialize a new instance of this class
         */
        public SocketImpl()