[9] Review request: 8180040: Exclude jdk.packager module from unified JDK 9 docs

[Kevin Rushforth]

Please review the following to exclude jdk.packager module from the JDK 
docs bundle:

https://bugs.openjdk.java.net/browse/JDK-8180040
http://cr.openjdk.java.net/~kcr/8180040/webrev.00/

I also added a missing package description for the jdk.packager.services 
package (in the jdk.packager.services module), since the 
jdk.packager.services module will remain in the docs.

-- Kevin