Request for review 6237353: Remove sun.io package from j2se binary

[Xueming Shen]

Hi,

This is something long over due. Some background info.

(1)The java.nio.charset package (to replace the private sun.io package) 
is added into
      JDK 1.4 as the result of the nio JSR. Part of the sun.io 
converters were migrated to
      the java.nio.charset  implementation in JDK8.
(2) All supported charsets/converters were migrated to java.nio.charset 
in JDK5. As the
      result no more bug fix/rfe maintenance work for sun.io since then.
(3) Removed all sun.io dependencies (internal sun.io usage inside JDK) 
from the JDK
      repository at the beginning of JDK6.
(4) The sun.io package was removed from the JDK runtime at JDK6 b29.

But we then had one important licensee strongly asked to undo the 
removal. The sun.io
was putback in JDK6 6u59/beta.

Now let's try this again in JDK8, the licensee that was against it in 
JDK6 last time has been
communicated and is OK with the plan this time. And the JDBC EG group 
(which heavily
used sun.io package in the past)  is/will be noticed as well. We assume 
after 3 major releases
the risk of breaking someone's application (as the result of this 
change) is limited.

Here is the webrev. Since we have tried it already (the workspace had 
been cleaned up
already) in jdk6 again already, the change this time is relatively 
simple, mainly only 2 makefile
changes. The rest is the "deleting" and several minor changes in testing.

http://cr.openjdk.java.net/~sherman/6237353/webrev/
http://cr.openjdk.java.net/~sherman/6237353/closed/

-Sherman