Reduce default restart delay to 1 second

Currently, when a job fails Flink will wait for 10 seconds until restarting the job. Even zero delay is a reasonable setting but will result in "flooding" the logs and quickly increasing the restart counter because at zero delay you will always see failures when no standby resources are available.

Reducing this to 1 second should make for a nicer out-of-box experience and not flood too much.