Update to ingress-nginx v1.8.1

[gambtho]

Description

Move to latest nginx version https://github.com/kubernetes/ingress-nginx/releases/tag/controller-v1.8.1

Includes addition of role/role-binding for the app-routing-system namespace, and reduction of privileges for the cluster role

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration. Is it a breaking change which will impact consuming tool(s)?

• [x] unit tests
• [x] make all-tests
• [x] manual tests - existing service before and after upgrade with continuous traffic

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[coveralls]

Pull Request Test Coverage Report for Build 6039182995

• 115 of 115 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 89.469%

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Totals
Change from base Build 6038401621:	0.5%
Covered Lines:	1971
Relevant Lines:	2203

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💛 - Coveralls