set aof rewrite status err, when fork fail (#5606)
set aof rewrite status err, when fork fail (#5606)

when aof rewrite is failed by fork(), It'll be indicated by aof_last_bgrewrite_status
INFO field, same as when the fork child fails later on.
oranagra/redis,charsyam/redis,PKRoma/redis,soloestoy/redis,PKRoma/redis,oranagra/redis,neomantra/redis,yossigo/redis,charsyam/redis,oranagra/redis,soloestoy/redis,oranagra/redis,PKRoma/redis,yossigo/redis,soloestoy/redis,neomantra/redis,yossigo/redis,charsyam/redis,antirez/redis,yossigo/redis,soloestoy/redis,ofirluzon/redis,soloestoy/redis,ofirluzon/redis,ofirluzon/redis,antirez/redis,oranagra/redis,neomantra/redis,yossigo/redis,ofirluzon/redis,antirez/redis,ofirluzon/redis,PKRoma/redis,PKRoma/redis,charsyam/redis,antirez/redis,neomantra/redis,charsyam/redis,neomantra/redis