Add some options to the NFS FlexVolume example

[nerzhul]

Add default options:

• _netdev
• soft
• intr
• timeo=10

Add params to the flex volume:

• protocol
• atime
• readonly

Add example pod

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[nerzhul]

/check-cla

cla is signed

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: idvoretskyi, nerzhul

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