[RFR]: 8223652: Rename IPSupport.skipIfCurrentConfigurationIsInvalid()

[Arthur Eubanks]

Bug: https://bugs.openjdk.java.net/browse/JDK-8223652
Webrev: http://cr.openjdk.java.net/~aeubanks/8223652/webrev.00/index.html

As mentioned in
https://markmail.org/search/?q=aeubanks%40google.com#query:aeubanks%40google.com+page:1+mid:rjthqgdeghv6vyck+state:results,
IPSupport.skipIfCurrentConfigurationIsInvalid() is ambiguous (how is it
skipping the test? what is a configuration?)

Something like IPSupport.throwSkippedExceptionIfNonOperational() is
probably better.
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