add space before configuration file name in startup message
What does this MR do?
Add a space before the name of the configuration file name in startup message.
Why was this MR needed?
The current startup message reads
2020-01-22T14:03:12.164753414Z Runtime platform arch=amd64 os=linux pid=6 revision=58272c27 version=12.7.0
2020-01-22T14:03:12.164793309Z Starting multi-runner from/etc/gitlab-runner/config.toml... builds=0
(using the version from the gitlab/gitlab-runner:latest Docker image). There is a space missing.