suse vag-build: add CPAN_ADDON; upgrade perl to 5.18.2
suse vag-build: add CPAN_ADDON; upgrade perl to 5.18.2

- If CPAN_ADDON is set in Makefile.local, the listed CPAN modules
  are added to the perldeps rpm package.
- upgrade perl version in perldeps to 5.18.2

aleibl/openxpki,stefanomarty/openxpki,oliwel/openxpki,oliwel/openxpki,aleibl/openxpki,aleibl/openxpki,stefanomarty/openxpki,stefanomarty/openxpki,openxpki/openxpki,oliwel/openxpki,stefanomarty/openxpki,stefanomarty/openxpki,aleibl/openxpki,oliwel/openxpki,openxpki/openxpki,stefanomarty/openxpki,oliwel/openxpki,openxpki/openxpki,aleibl/openxpki,openxpki/openxpki,oliwel/openxpki,aleibl/openxpki