[rfc] [icedtea-web] restrict all connections to origins also to ports

[Jiri Vanek]

Hello!

Itw have nasty habit (from jdk7 and older times) that it ignore port in case of Socket permission. 
We already consider port in UrlPermissions  and jdk8 internally is considering port more strictly 
then 7.  So I do not see point to ignore port for socket permissions anymore.

The attached patch is adding port restricttions to all network permissions on way.
(part of it is simple refactoring from String host to URL host in some places.

I would like to push this to 1.6 and very probably to 1.5 too, although it is behaviour-changing patch,


J,
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