Increase ansible timeout to 300

[rptaylor]

What type of PR is this?

/kind feature

What this PR does / why we need it:
For large clusters, ansible plays can take a very long time, so failing a play is very expensive.
This increases the ansible timeout so that some nodes that might be slow to respond will still have a chance to save the play.
On small clusters there should not be any disadvantage.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[yankay]

/ok-to-test

[yankay]

Thanks @rptaylor

It's reasonable, Thanks :-)
/lgtm

[rptaylor]

/assign liupeng0518

[liupeng0518]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liupeng0518, rptaylor

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