Fix wrong license headers

[beni0888]

Summary
In Kubeapps, we use the GitHub action apache/skywalking-eyes/header to ensure that all the files in the project contain the required license header according to the license that rules the project (currently Apache-2.0). This GitHub action uses a config file ./licenserc.yml where we specify the parameters for the license headers that should be checked. Between those parameters is the copyright-owner, currently set to the Kubeapps contributors. However, several files in the project contain a license header that doesn't match this owner (they're pointing to VMware, Inc., the owner used in the past).

Background and rationale
We should fix the license header for all the non-compliant files, to be consistent throughout the project.

Acceptance criteria
All the files in the repository that contains a license header point to the right copyright owner (the Kubeapps contributors).