RFR JDK-8191533,jar --describe-module prints service provider class names in lower case

[Xueming Shen]

Hi,

Please help review the change for JDK-8191533
issue: https://bugs.openjdk.java.net/browse/JDK-8191533
webrev: http://cr.openjdk.java.net/~sherman/8191533/webrev/

The jmod change has been verify by applying jmod on those modules at jdk 
home.

thanks!
sherman