Added HTTPRoute Creation/Update E2E Tests

[rlymbur]

What type of PR is this?
Feature, additional HTTPRoute E2E Tests

Which issue does this PR fix:
#273

What does this PR do / Why do we need it:
Adds HTTPRoute creation/update E2E tests to improve test coverage

Testing done on this change:

FOCUS="" make e2etest

...

------------------------------

Ran 11 of 11 Specs in 4656.643 seconds
SUCCESS! -- 11 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestIntegration (4656.81s)
PASS

Automation added to e2e:
N/A

Will this PR introduce any new dependencies?:
No.

Will this break upgrades or downgrades. Has updating a running cluster been tested?:
This will not break upgrades or downgrades. These changes were tested on the latest v0.0.15 release.

Does this PR introduce any user-facing change?:
No, only additional E2E tests.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.