'run-rollouts-e2e-tests.sh' should fail outright when an individual test fails

[jgwest]

What type of PR is this?
/kind bug

What does this PR do / why we need it:

• At present, the 'run-rollouts-e2e-tests.sh' script should fail when one of the child test suite fails
• The 'set -e' check was missing which should have been present initially, I have added it

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

[openshift-ci]

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[jgwest]

/retest

[jgwest]

/retest

[jgwest]

/retest

[chetan-rns]

Thanks @jgwest

/lgtm

[jgwest]

Thanks @chetan-rns!