bcel5_3-5.3-bp156.3.8

- Build with source and target 8 to prepare for a possible removal
  of 1.6 compatibility

- Fix build with jdk9:
  * specify java source and target level 1.6
  * specify encoding of source files
- Clean spec file and fix rpmlint errors

- Move from jpackage-utils to javapackage-tools

- Remove redundant tags/sections from specfile

- Initial SUSE packaging of bcel5_3 (from jpackage.org 5.0)