ci(aio): fix and enable e2e tests on Travis

[gkalpak]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[x] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
E2E tests where disabled, because they were failing on Travis.

What is the new behavior?
E2E tests are enabled and pass on Travis.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[x] No

Other information:
Follow-up to #14102.

[IgorMinar]

thanks!

[IgorMinar]

@robwormald @hansl - was this scaffolded by the CLI?

looks like it was - https://github.com/angular/angular-cli/blob/916e9bd61773fce94c5867675842b0215e14e267/packages/angular-cli/blueprints/ng2/files/protractor.conf.js#L17

@hansl can we change this?

[gkalpak]

I just found out that since angular/protractor@2bde92b, both jasmine and jasmine2 point to Jasmne 2.x.
So, this change is not necessary for the version of Protractor that the cli is using.
cc @hansl, @IgorMinar, @robwormald

[hansl]

What's to change? Jasmine2?

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