Support for imagePullSecrets For fluentBit daemonset

[deveshk0]

This PR add supports for imagePullSecrets for FluentBit Daemonset.

issue - #92

[benjaminhuo]

Some changes are overlapping with #93

[deveshk0]

I guess #93 is limited to operator and this introdues changes for daemonset

[wenchajun]

Thanks a lot. This may need to be revised as well(fluentbit-operator/api/fluentbitoperator/v1alpha2/zz_generated.deepcopy.go )
like this

if in.ImagePullSecrets != nil {
in, out := &in.ImagePullSecrets, &out.ImagePullSecrets
*out = make([]v1.LocalObjectReference, len(*in))
copy(*out, *in)
}

[deveshk0]

ohh I thought It was auto-generated. I will update

[deveshk0]

@wenchajun I have updated it, Can you please have a look?

[wanjunlei]

You need to run make manifests and update the files.

[deveshk0]

@wanjunlei Updated files.