apache-commons-exec-1.3-160000.2.2

- Spec file cleanup

- Use %autosetup macro. Allows to eliminate the usage of deprecated
  %patchN.

- Build with java source and target levels 8

- Initial packaging of apache-commons-exec 1.3
- Added patch:
  * commons-exec-1.3-build_xml.patch
    + Adapt the build.xml file to produce javadoc, to be able
    to switch off tests from command-line and add a proper OSGi
    manifest