RFR: 8210373: Deadlock in libj2gss.so when loading "j2gss" and "net" libraries in parallel.

[Weijun Wang]

`InetAddress` is loading native library `net` and at the same time `SunNativeProvider` is loading `j2gss`, and in the `OnLoad` function inside `j2gss` it is calling `FindClass(env, "java/net/InetAddress")` and thus a deadlock.

We can access `InetAddress` in `SunNativeProvider.<clinit>` before loading the jgss library. i.e. use `Class.forName` to ensure `InetAddress` is initialized. Thanks to @dholmes-ora for providing this workaround.

No new regression test, hard to reproduce.

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Commit messages:
 - 8210373: Deadlock in libj2gss.so when loading "j2gss" and "net" libraries in parallel.

Changes: https://git.openjdk.java.net/jdk/pull/2655/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2655&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8210373
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2655.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2655/head:pull/2655

PR: https://git.openjdk.java.net/jdk/pull/2655