Increase drain timeout to 5 minutes

[rafis]

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When upgrading 100+ clusters the most often encountered error was drain timeout error:

There are pending pods in node "node-i8ou" when an error occurred: drain did not complete within 1m0s\npod/coredns-85cc5bdd54-pk5cb\nerror: unable to drain node "node-i8ou", aborting command...\n\nThere are pending nodes to be drained:\n node-j9rv\nerror: drain did not complete within 1m0s\n

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This change is 

[vmwclabot]

@rafis, you must sign every commit in this pull request acknowledging our Developer Certificate of Origin before your changes are merged. This can be done by adding Signed-off-by: John Doe <john.doe@email.org> to the last line of each Git commit message. The e-mail address used to sign must match the e-mail address of the Git author. Click here to view the Developer Certificate of Origin agreement.

• Commit 9ce98e3 must be signed by rnganeye@mts.ru

[rocknes]

Reviewed 3 of 3 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @rafis)