RFR 8043954: Fix behavior difference of connect() for AIX

[Jonathan Lu]

Hello,

Could I have following patch reviewed for bug 8034954 ?

http://cr.openjdk.java.net/~luchsh/JDK-8043954/

The patch is to fix a behavior difference of connect() API for AIX platform,
according to the documentation,
http://www-01.ibm.com/support/knowledgecenter/ssw_aix_71/com.ibm.aix.commtrf2/connect.htm?lang=en

On AIX, when connect() got interrupted by signal, the underlying connection
will be made asynchronously,

"EINTR The attempt to establish a connection was interrupted by delivery of
a signal that was caught; the connection will be established
asynchronously."

This fix tries to poll() for successfully established connection or error
in the similar way as NET_Timeout().

Thanks
Jonathan
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