[7u-dev] Request for approval for 6566891

[shanliang]

This is a simple export/import backport for
    6566891: RMIConnector: map value referencing map key in WeakHashMap 
prevents map entry to be removed

bug: https://bugs.openjdk.java.net/browse/JDK-6566891
jdk 8 changeset: http://hg.openjdk.java.net/jdk8/tl/jdk/rev/2d51653d9b4b
jdk 8 review: 
http://mail.openjdk.java.net/pipermail/serviceability-dev/2013-August/011229.html

Thanks,
Shanliang