bump kubeaddons-addon-initializer to v0.5.4 to match the rest of the addons

[joejulian]

What type of PR is this?

Bug

What this PR does/ why we need it:

Use one single common version of kubeaddons-addon-initializer throughout all of KBA

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

Checklist

• The commit message explains the changes and why are needed.
• The code builds and passes lint/style checks locally.
• The relevant subset of integration tests pass locally.
• The core changes are covered by tests.
• The documentation is updated where needed.

[d2iq-mergebot]

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@mesosphere-mergebot backport  

[joejulian]

@mesosphere-mergebot backport release/4

[d2iq-mergebot]

Backport PR for release/4: #1424

[gracedo]

oh wait we should bump the revision number

[gracedo]

we actually also need to bump opsportal to the latest version which pulls in the same version of kommander ui as kommander, closing this in favor of #1380. I've cherry-picked the initializer img to that branch