local-path-provisioner

1. Add the Helm chart
2. Fixed Provisioner falls over after etcd timeout and a few other issues.
3. Compatible with Kubernetes v1.16

Change pull policy for helper pod to IfNotPresent.

Thanks to @km4crus , we've added ARM64 support

Thanks to @vvitkovskiy, now the helper pod tolerates all the taints.

Since the pod is able to use the node, the helper pod should be able to
run on the node as well.

Thanks to @anitgandhi , now we use alpine based image for smaller image size! The image size has been reduced to 12MB from 135 MB.

Thanks to @kmova , fix an issue that local path provisioner cannot be used in non-default namespace.

Fully fix security context permission issue #7 by @unguiculus in #9

1. Added security context support (#7)
2. Added helper image parameter (--helper-image)

1. Fix the support for Kubernetes v1.12.
2. Drop the support for Kubernetes v1.11.