[9]RFR: 8062588: Support java.util.spi.*, java.text.spi.*, java.awt.im.spi loaded from classpath

[Naoto Sato]

Hello,

Please review the proposed changes for the following issue:
https://bugs.openjdk.java.net/browse/JDK-8062588

The proposed fix is located at:

http://cr.openjdk.java.net/~naoto/8062588/webrev.00/

The change is to load SPI implementations from application's class path 
instead of the extension mechanism, which is removed with the JEP 220.

Naoto