Added a new option --bearer-token TEXT in the Armada CLI to allow
the users or applications to pass kubernetes-api bearertokens via
tiller to the kubernetes cluster. This is to allow armada to interact
with a kubernetes cluster that has been configured with an external
Auth-Backend like Openstack-keystone or OpenId Connect.
Bearer Tokens are Auth tokens issued by the identity backends
such as keystone which represent a users authorized access.
For better understanding of bearer tokens, an example case
of how they works can be found here
https://kubernetes.io/docs/reference/access-authn-authz/authentication/#putting-a-bearer-token-in-a-requesthttps://docs.docker.com/registry/spec/auth/token/
Change-Id: I03623c7d3b58eda421a0660da8ec3ac2e86915f0
Signed-off-by: Shoaib Nasir <shoaib.nasir@windriver.com>