Fix AWS OIDC settings

[PatrickXYS]

Which issue is resolved by this Pull Request:
Resolves #945

Description of your changes:
Since we have the issues like:

time="2020-02-23T06:33:18Z" level=error msg="Email doesn't exist in user's claim map[exp:1.582439718e+09 iss:https://kubeflow.auth0.com/ sub:github|4739316]. This is not supported"
time="2020-02-23T06:33:18Z" level=error msg="Email doesn't exist in user's claim map[exp:1.582439718e+09 iss:https://kubeflow.auth0.com/ sub:github|4739316]. This is not supported"

We need to add auth scope to override default setting, which is:

 alb.ingress.kubernetes.io/auth-scope: 'openid email profile'

Modified ingress.yaml, kustomize.yaml, and params.env files to fulfill the functionality.

Checklist:

• Unit tests have been rebuilt:
  1. cd manifests/tests
  2. make generate-changed-only
  3. make test

---

This change is 

[k8s-ci-robot]

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[PatrickXYS]

/assign @Jeffwan

[Jeffwan]

Can you update cognito example as well?

email	openid	aws.cognito.signin.user.admin	profile

[Jeffwan]

Seems it's hard to convert email openid profile env to configmap values. Just use simple solution here.

[Jeffwan]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jeffwan

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Needs approval from an approver in each of these files:

• aws/OWNERS [Jeffwan]
• tests/OWNERS [Jeffwan]

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