banip: update 1.8.8-3

banip: update 1.8.8-3

- gated config sanity checks at the end of banip-functions.sh
   behind 'ban_action' to skip them on init script sourcing paths (enable/disable/help)
- added a ubus socket guard around f_system to harden against pre-ubus sourcing
- added a 'ban_bver' fallback in f_log for sourcing paths without prior f_system execution
- reordered system utility references before system library sourcing,
   so f_log has a valid 'ban_logcmd' available if the library check fails
- minor code improvements and fixes

Signed-off-by: Dirk Brenken <redacted>