[ebtables] use Rustys new module scheme in ebtables.c, vs 2.5.56

- use /* */ instead of //
- change my mail alias
- remove MOD_DEC_USE_COUNT and MOD_INC_USE_COUNT
- use try_module_get (and check result) and module_put instead of
  __MOD_INC_USE_COUNT and __MOD_DEC_USE_COUNT
- add \n in init/exit messages