loop reaping dead children

[c0b]

Current code isn't very correct: because Linux signal system design
follows SysV Unix behavior, when a SIGCHLD happens, it only means there
are child programs died (either self-quit or involuntarily killed, from
wstatus may figure out), linux kernel only deliver SIGCHLD once to parent
before the parent process;
so when SIGCHLD happens, you don't know is that one child only or more

so the code need a loop until wait4 returns zero, at rumtime got this:

2017/07/14 21:14:32 reap dead child: 579, wstatus: 0x00000000
2017/07/14 21:14:32 reap dead child: 580, wstatus: 0x00000000
2017/07/14 21:14:32 reap dead child: 583, wstatus: 0x00000000

then in the container there are no more zombies. final resolve #26

[c0b]

your CI seems failed at openssl equinox lines?

$ openssl aes-256-cbc -K $encrypted_6219389dc5b7_key -iv $encrypted_6219389dc5b7_iv -in equinox.key.enc -out equinox.key -d
iv undefined
The command "openssl aes-256-cbc -K $encrypted_6219389dc5b7_key -iv $encrypted_6219389dc5b7_iv -in equinox.key.enc -out equinox.key -d" failed and exited with 1 during .
Your build has been stopped.