add targetRamMb to kubeAPIServer spec

[captainkerk]

This PR adds support for setting targetRamMb in the kube apiserver spec

[captainkerk]

The travis build is failing on make gen-cli-docs, which is failing on master as well. I'm happy to add it to this PR, though I suppose that deserves its own PR.

[justinsb]

Sorry, the make gen-cli-docs is because I temporarily broke master trying getting some old docs prs merged - ignore it and I'll force-merge once it's only travis failing.

I'm was just debating how we should name the flag - Mb or MB. We haven't been very consistent about resources in flags...

I think Mb is both more correct and more consistent, therefore...

/approve
/lgtm
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: captainkerk, justinsb

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[justinsb]

Manually merging because all tests but travis have passed, and travis failure is known problem with master (since resolved).

[captainkerk]

Thank you Justin!