v0.15: Exit with non-zero with exception. Fix dnsjava lib.
This release fixes two issues reported by @SvenVD-be:
- jdnssec-verifyzone would throw an exception when parsing a "CAA" record. This was fixed by correcting the version of the dnsjava library.
- jdnssec-verifyzone would still exit with 0 even if it threw an exception.