WIP: Add script to update example manifests

[kragniz]

Fixes #260.

NONE

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[kragniz]

This currently only updates the cassandra example. The elasticsearch example a bit more different from the manifest used in e2e tests, so I haven't added it yet.

/cc @munnerz

[jetstack-bot]

@kragniz: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
navigator-e2e-v1-7	bbb0b72	link	/test e2e v1.7

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[munnerz]

We also need a corresponding verify script here.

FWIW, as I've said before, I do not think our e2e tests should only be driven by docs. Instead, we should have tests for the things in our docs (i.e. using sphinx's testing features), but the e2e test suite should test more advanced features which may or may not make sense to include in our documentation.

[jetstack-bot]

@kragniz: PR needs rebase.

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