Added ttl validation in admission controller

[SrinivasChilveri]

ttl validation in admission controller.

travis result

[SrinivasChilveri]

@hzxuzhonghu ,added validation in admission controller. pls do have a look.

[hzxuzhonghu]

/lgtm

@SrinivasChilveri Could you add a default value for it when it is nil?

[TommyLike]

/lgtm

@SrinivasChilveri Could you add a default value for it when it is nil?

Would be conflicted to your design:

	// ttlSecondsAfterFinished limits the lifetime of a Job that has finished
	// execution (either Completed or Failed). If this field is set,
	// ttlSecondsAfterFinished after the Job finishes, it is eligible to be
	// automatically deleted. If this field is unset,
	// the Job won't be automatically deleted. If this field is set to zero,
	// the Job becomes eligible to be deleted immediately after it finishes.
	// +optional

/lgtm

[k82cn]

/lgtm
/approve

[SrinivasChilveri]

/lgtm

@SrinivasChilveri Could you add a default value for it when it is nil?

can i add default value as 10 ?

[hzxuzhonghu]

@TommyLike Yeah， should update the desc.

can i add default value as 10 ?

I think this should be large enough to allow users to check logs / results. I prefer 1 day, @k82cn @TommyLike WDYT