RFR(s): 8228580: DnsClient TCP socket timeout

[Milan Mimica]

Hello

Continuing in a new thread with a RFR of my own:
http://cr.openjdk.java.net/~mmimica/8228580/webrev.00/

It has the fixes applied from the first review of the patch.

The test was sporadically failing not because of missing
synchronization, but more likely because test was not waiting for the
TCP server thread to actually start.
Made it throw jtreg.SkippedException if TCP port is in use. We can
just hope it does not happen too often.
Fixed typos.


-- 
Milan Mimica