pkg/promtail/positions: remove executable bit from positions file (#893)
pkg/promtail/positions: remove executable bit from positions file (#893)

File permissions on creation of positions.yaml will now be 0600
instead of 0700.

Fixes #892.
grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki