Fix: Correct fluentd prase TimeFormat config key

[Jakob3xD]

What this PR does / why we need it:

It changes the TimeFormat config value from time_type to time_format as it should be.

Which issue(s) this PR fixes:

Fixes #778
Fixes #781

Does this PR introduced a user-facing change?

Fix: Correct fluentd prase TimeFormat config key
Fix: Correct Kubebuilder validation for TimeType from *string to string

Additional documentation, usage docs, etc.:

[benjaminhuo]

should change like this?

Suggested change

	// Process value according to the specified format. This is available only when time_type is string
	// Process value according to the specified format. This is available only when time_format is string

[Jakob3xD]

It is correct how it is right now. The time_format only applies when time_type is set to the value string.

[wenchajun]

https://github.com/fluent/fluent-operator/blob/master/apis/fluentd/v1alpha1/tests/helper_test.go#L355
It also seems to need revision here.

[benjaminhuo]

https://github.com/fluent/fluent-operator/blob/master/apis/fluentd/v1alpha1/tests/helper_test.go#L355 It also seems to need revision here.

Yes, the CI error also needs to be fixed @Jakob3xD
https://github.com/fluent/fluent-operator/blob/master/apis/fluentd/v1alpha1/tests/helper_test.go#L556

[Jakob3xD]

Yes, the CI error also needs to be fixed @Jakob3xD

Should be fixed now. I updated the key and removed the new line at the end of file which was added by my vim.

[benjaminhuo]

@Jakob3xD Thank you