ignore bad conf file

[Lukas Tribus]

> Thanks Lukas! I tried configtest but with 100k files in conf.d, it 
> takes 3 minutes to finish, during which time there may be another file 
> dropped in conf.d and trigger another configtest. This sometimes causes 
> several config test running at the same time. 
> A reload on the other hand is much quicker and returns almost 
> immediately. I understand this is just a sighup and nginx internally 
> may still take as much longer to finish reload? If there is only one 
> file change, will reload cause nginx to reread all the 100k files and 
> process them?

Yes. nginx will not "change" its configuration, it will start a new
process with the new configuration. You can find more details about
this in the link I posted.