This commit is changing the keepalive exported api and the modules using it don't build anymore, for now drouting is reported by LGTM analysis to be broken:
``` [2020-05-04 14:29:31] [build] CC (gcc) [M drouting.so] drouting.o [2020-05-04 14:29:31] [build] drouting.c: In function ‘dr_update_keepalive’: [2020-05-04 14:29:31] [build] drouting.c:226:26: warning: passing argument 4 of ‘keepalive_api.add_destination’ makes integer from pointer without a cast [-Wint-conversion] [2020-05-04 14:29:31] [build] 226 | &cur->ip, &owner, 0, dr_keepalive_statechanged, cur); [2020-05-04 14:29:31] [build] | ^~~~~~~~~~~~~~~~~~~~~~~~~ [2020-05-04 14:29:31] [build] | | [2020-05-04 14:29:31] [build] | void (*)(str *, ka_state, void *) {aka void (*)(struct _str *, int, void *)} [2020-05-04 14:29:31] [build] drouting.c:226:26: note: expected ‘int’ but argument is of type ‘void (*)(str *, ka_state, void *)’ {aka ‘void (*)(struct _str *, int, void *)’} [2020-05-04 14:29:31] [build] drouting.c:226:53: warning: passing argument 5 of ‘keepalive_api.add_destination’ from incompatible pointer type [-Wincompatible-pointer-types] [2020-05-04 14:29:31] [build] 226 | &cur->ip, &owner, 0, dr_keepalive_statechanged, cur); [2020-05-04 14:29:31] [build] | ^~~ [2020-05-04 14:29:31] [build] | | [2020-05-04 14:29:31] [build] | pgw_t * {aka struct pgw_ *} [2020-05-04 14:29:31] [build] drouting.c:226:53: note: expected ‘ka_statechanged_f’ {aka ‘void (*)(struct _str *, int, void *)’} but argument is of type ‘pgw_t *’ {aka ‘struct pgw_ *’} [2020-05-04 14:29:31] [build] drouting.c:225:3: error: too few arguments to function ‘keepalive_api.add_destination’ [2020-05-04 14:29:31] [build] 225 | keepalive_api.add_destination( [2020-05-04 14:29:31] [build] | ^~~~~~~~~~~~~ [2020-05-04 14:29:32] [build] make[2]: *** [../../Makefile.rules:100: drouting.o] Error 1 [2020-05-04 14:29:32] [build] make[1]: *** [Makefile:511: modules] Error 1 [2020-05-04 14:29:32] [build] make[1]: Leaving directory '/opt/src/src' [2020-05-04 14:29:32] [build] make: *** [Makefile:34: all] Error 2 ```