RFR: JDK-8232042: [macos] Installation fails if application name contains spaces

[Alexander Matveev]

Please review the jpackage fix for bug [1] at [2].

This is a fix for the JDK-8200758-branch branch of the open sandbox 
repository (jpackage).

- Patch is based on JDK-8231856 fix.
- Fixed by using URI to escape URLs. URLEncoder.encode() encodes form 
data and it will use "+" for space. pkg build tool expects URL with 
space encoded as "%20".

[1] https://bugs.openjdk.java.net/browse/JDK-8232042

[2] http://cr.openjdk.java.net/~almatvee/8232042/webrev.01/

Thanks,
Alexander