* more startup tweaks
* re-use f_log function in helper scripts
* small fixes / polish up for forthcoming 19.07 release

Signed-off-by: Dirk Brenken <dev@brenken.org>

* fix race condition in download utility detection during boot
* fix multiple possible bugs in ipset creation
* prevent parallel service starts
* refine service trigger handling
* add ssh daemon auto detection
* print to stdout if 'logger' is not available

Signed-off-by: Dirk Brenken <dev@brenken.org>

* new 'ca-bundle' dependency as all https connections
  are now validated by default
* automatically select the download utility: 'aria2', 'curl',
  'uclient-fetch' with libustream-* or wget are supported
* track & ban failed LuCI login attempts as well
* add a small log/banIP background monitor to block
  SSH/LuCI brute force attacks in realtime (disabled by default)
* add a config version check (please update your default config!)
* made the automatic wan detection more stable
* fix the IPv6 logfile parser
* fix the service status message
* update readme

Signed-off-by: Dirk Brenken <dev@brenken.org>