fix(hapi-engine): update hapi-engine integration

[bisubus]

• What modules are related to this pull-request
• express-engine
• grunt-prerender
• gulp-prerender
• hapi-engine
• universal-next
• universal
• webpack-prerender
• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  remove unused proxy imports from some test files

Adds the implementation of Hapi template view engine for Universal, similar to Express engine.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  No

[MarkPieszak]

@bisubus Let us know if you need any help with how the express engine is doing things. Shouldn't be too bad though.

Also, thanks for working on the integration, keep it up! 👍

[bisubus]

@MarkPieszak Thanks, I guess I've sorted this out, rendering part is quite straightforward.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request) and all commit authors, but as best as we can tell these commits were authored by someone else. If that's the case, please add them to this pull request and have them confirm that they're okay with these commits being contributed to Google. If we're mistaken and you did author these commits, just reply here to confirm.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request) and all commit authors, but as best as we can tell these commits were authored by someone else. If that's the case, please add them to this pull request and have them confirm that they're okay with these commits being contributed to Google. If we're mistaken and you did author these commits, just reply here to confirm.

[bisubus]

That's ok, googlebot.

[yannickglt]

Need this! 👍

[PatrickJS]

won't be added in ng4
angular/angular#13822

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