filebeat: silently dies when Configfile is broken.

[C0RD]

Hello,

I accidently added a TAB-Character in my Configfile. When running filebeat with it it silently dies.

Config-Example: (I put <TAB> in it)

filebeat:
prospectors:

paths:
  -<TAB>/var/log/squid/access_log
type: log

filebeat should interpret whitespace-characters as spaces. (or produce some kind of meainingful error)

[andrewkroh]

We are working providing better configuration parsing and validation. Follow at #657

The error for the tab character in the YAML file was probably routed to the default logging destination which is syslog. Adding -e to the filebeat arguments will route the log stderr. But that's not very intuitive.