* feat(external-provisioner/local-path-provisioner): adds support for local path provisioner

Helpful for local development but also in production workloads (once the
permission model is worked out) where you have redundancy built into the
software uses the PVCs (e.g. database cluster with synchronous
replication)

* feat(local-path-provisioner): adds debug flag, image tag group var

* fix(local-path-provisioner): moves image repo/tag to download role

* test(gce_centos7-flannel): enables local-path-provisioner in test case

* fix(addons): add image repo/tag to commented default values

* fix(local-path-provisioner): typo in jinja template for local path provisioner

* style(local-path-provisioner): debug flag condition re-formatted

* fix(local-path-provisioner): adds missing default value for debug flag

* fix(local-path-provisioner): syntax fix for debug if condition end

* fix(local-path-provisioner): jinja template syntax: if condition white space