pkg/nimble/netif_conn: improve debug messages
pkg/nimble/netif_conn: improve debug messages

OTAkeys/RIOT,miri64/RIOT,OTAkeys/RIOT,ant9000/RIOT,OlegHahm/RIOT,x3ro/RIOT,yogo1212/RIOT,ant9000/RIOT,miri64/RIOT,miri64/RIOT,josephnoir/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,toonst/RIOT,smlng/RIOT,x3ro/RIOT,basilfx/RIOT,miri64/RIOT,authmillenon/RIOT,josephnoir/RIOT,mtausig/RIOT,kYc0o/RIOT,kaspar030/RIOT,toonst/RIOT,yogo1212/RIOT,ant9000/RIOT,mtausig/RIOT,ant9000/RIOT,josephnoir/RIOT,kYc0o/RIOT,aeneby/RIOT,OTAkeys/RIOT,kYc0o/RIOT,OTAkeys/RIOT,smlng/RIOT,aeneby/RIOT,miri64/RIOT,x3ro/RIOT,yogo1212/RIOT,jasonatran/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,jasonatran/RIOT,authmillenon/RIOT,kaspar030/RIOT,aeneby/RIOT,jasonatran/RIOT,mtausig/RIOT,jasonatran/RIOT,kaspar030/RIOT,OlegHahm/RIOT,josephnoir/RIOT,mtausig/RIOT,OlegHahm/RIOT,smlng/RIOT,yogo1212/RIOT,basilfx/RIOT,toonst/RIOT,yogo1212/RIOT,basilfx/RIOT,smlng/RIOT,toonst/RIOT,smlng/RIOT,kYc0o/RIOT,x3ro/RIOT,basilfx/RIOT,toonst/RIOT,mtausig/RIOT,jasonatran/RIOT,yogo1212/RIOT,authmillenon/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,aeneby/RIOT,josephnoir/RIOT,kaspar030/RIOT,authmillenon/RIOT,ant9000/RIOT,aeneby/RIOT,basilfx/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,x3ro/RIOT,kaspar030/RIOT