Patch to file/Connection.java

[Per Bothner]

This brings opening of file URLs closer to JDK behavior.

The immediate problem was that the FileNotFoundException
did not include the filename in the message.  I noticed
from a JDK exception stack trace that JDK was opening
the InputStream in connect.  The suggested that getInputStream
should not open a stream, but return an already-opened one.
A test program verified that call getInputStream twice
would return the identical InputStream each time.

As a side-effect we get more consistent FileNotFoundExceptions.

I will check this in unless someone complains loadly and quickly enough.
-- 
	--Per Bothner
per@bothner.com   http://www.bothner.com/per/
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