Remove cert-manager, and create certs through annotations

Changelog:

• Removes cert-manager dependency and doesn't create Certificates anymore, instead certificates are provided by "ingress shim" through the use of annotations.

Updated RBAC for cert-manager

Fix cert RBAC issue found by @ajaegle

Thanks to @ajaegle for noticing this. The Operator needs to be
tested in-cluster, since local testing with Go gives admin RBAC
by default.

Ref: #6

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

Adds cert-manager support

Add cert-manager support

This patch allows certificates to be automated for Ingress objects
created by the controller. Tested e2e for create.

Todo: update.

Signed-off-by: Alex Ellis <alexellis2@gmail.com>