local-path-provisioner doesn't work on clusters without internet

[iirekm]

Fixing Helm chart is easy: add HELPER_IMAGE with env var to point to the proper address of busybox.

But additionally imagePullSecrets has to be added to the create-xxxx pods generated by the provisioner and there's no way to do it.

[hwaastad]

@yasker this would be a minor change I think by extending the podpec in provisioner.go:

ImagePullSecrets: []v1.LocalObjectReference{
				{Name: p.pullSecret}, // should be loop of spec.imagepullsecrets
			},

We have met this issue our self having to use a private docker proxy.
I can add a PR for this one, but in my simple impl (since I have a limited knowledge of the go-client) I've added a pullproxy option to the provisioner (similar to the --helper-image). (Would probably be best if it was injected from the spec.imagepullsecrets from deployment,if possible)

[yasker]

Seems we should add an image pull secret option in the cmdline.

[vincent-herlemont]

If the PR #119 is merged, this issue shouldn't be closed?