multiple minor fixes and improvements to travis and package build

These commits contain just a couple of minor fixes...

- fix typo in makefile for suse custom config package
- fixes to enrollment UI code
- read version from static VERSION file when building core/server to allow
  for autobuild from tarballs without working tools/vergen (e.g. missing git)
- add CPAN mirror to travis and prepare path for myperl
- add GIT_COMMIT_DATE to tools/vergen
- add NetAddr::IP to prereq list core/server/Makefile.PL