Panic on agent.interval = "0s"

[danielnelson]

Bug report

When setting the agent.interval to "0s", telegraf panics.

Relevant telegraf.conf:

[agent]
  interval = "0s"

System info:

Telegraf vdev-87-g8514acdc (git: master 8514acd)

Steps to reproduce:

1. Set agent.interval to "0s"
2. Start telegraf

Expected behavior:

Telegraf should report an error and exit.

Actual behavior:

2017/03/20 16:26:27 I! Using config file: /home/dbn/.telegraf/telegraf.conf
2017-03-20T23:26:27Z I! Starting Telegraf (version dev-88-ga962e958)
2017-03-20T23:26:27Z I! Loaded outputs: file
2017-03-20T23:26:27Z I! Loaded inputs: inputs.logparser
2017-03-20T23:26:27Z I! Tags enabled: host=loaner
2017-03-20T23:26:27Z I! Agent Config: Interval:0s, Quiet:false, Hostname:"loaner", Flush Interval:5s 
2017/03/20 16:26:27 Seeked 2484.log - &{Offset:0 Whence:0}
panic: runtime error: integer divide by zero

goroutine 1 [running]:
github.com/influxdata/telegraf/agent.(*Agent).Run(0xc42000e038, 0xc420430180, 0x0, 0x0)
        /home/dbn/src/influx/src/github.com/influxdata/telegraf/agent/agent.go:364 +0x569
main.reloadLoop(0xc420286060, 0x19d47f8, 0x0, 0x0, 0x19d47f8, 0x0, 0x0, 0x19d47f8, 0x0, 0x0, ...)
        /home/dbn/src/influx/src/github.com/influxdata/telegraf/cmd/telegraf/telegraf.go:214 +0xa01
main.main()
        /home/dbn/src/influx/src/github.com/influxdata/telegraf/cmd/telegraf/telegraf.go:367 +0x647

Additional info:

#2546

[danielnelson]

Fixed in 1.4