Set the default AWS disk size to 120Gb across both workers and masters

[smarterclayton]

Workers often have similar IO needs as masters for container images, and
may be used for empty disk. For maximum out of the box flexibility, set
the node sizes for both masters and workers to 120Gb.

Will improve e2e test performance, also make builds quite a bit snappier
as they are often IO limited.

[smarterclayton]

/assign @wking

[wking]

/lgtm
/retest

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: smarterclayton, wking

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[wking]

e2e-aws:

level=info msg="Waiting up to 10m0s for the openshift-console route to be created..."
level=fatal msg="waiting for openshift-console URL: context deadline exceeded"

/retest