Disable paging when using low --bandwidth during storage migration
Disable paging when using low --bandwidth during storage migration

This change unsets resource.Builder.RequestChunksOf when a low
bandwidth value is used.  This prevents ResourceExpired errors
caused by the workers being forcibly slowed to the point that a MVCC
compaction occurs before the full list for a resource completes.

Paging is still used when --bandwidth is set to zero.

The aforementioned errors manifested as:

The provided from parameter is too old to display a consistent list
result. You must start a new list without the from.

Signed-off-by: Monis Khan <19f7b2d00144930eab99c4cfd2a8d2d2a225ef67@redhat.com>

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