RFR (small): Modularizer should scan whole classpath for services

[Chris Hegarty]

There is a small issue in the Modularizer where some 
META-INF/service/XXX files are not being correctly copied to the on disk 
"exploded" modules ( these are used to create the jmod/deb packages ) 
during the build.

The issue is that service providers can be in multiple files/jars in the 
classpath. For example, there are two 
META-INF/service/com.sun.jdi.connect.Connector files, one in sa-jdi.jar 
(for the serviceability agent) and one in tools.jar. It is important to 
preserve these META-INF files in the jmod/installed modules as they are 
still used to find services in classpath mode (they do not effect module 
mode).

The above example, com.sun.jdi.connect.Connector, is the only instance 
of this situation in the JDK that I can find, but I think it is a 
general problem so I have changed the Modularizer to search the whole 
classpath when looking for services rather exiting early once one is 
found. The META-INF/service/XXX are files are then concatenated.

http://cr.openjdk.java.net/~chegar/jigsaw/sajdi_webrev.00/webrev/

Note:
  This issue was noticed when running the com/sun/jdi tests and 
manifests itself as follows:
   "java.lang.IllegalArgumentException: No connector named:
     com.sun.jdi.CommandLineLaunch"

Thanks,
-Chris.