remove obsolete bugzilla code
use COMMENT_TYPE from storage
obsolete old bugzilla executables
storage: drop bugzilla COMMENT_TYPE(s) from db

They are not exposed from the bugzilla API and we
don't rely on these.

Red Hat specific getBug function was used to fetch
these and it is not supported anymore.
storage: add creator relation to RhbzBug
add retry and daterange utils and their tests
pyfaf.bugzilla rewrite
retry: print exception nicely
argparse: allow passing default verbosity level
add new faf-bugzilla-pull-bugs executable
update spec
updated task_pull_bugs to use new exutable
NEWS updated