Ryan Liang 3ecdc2bfc8 VNX: add option vnx_async_migrate ...

Before this fix, customers can disable async migration only by passing
`--metadata async_migrate=False` in volumes metadata. This fix adds an
option named `vnx_async_migrate` which could help set the default value
of async migration for whole backend. If customers don't pass in the
`async_migrate` in metadata, the value of this option will be used.

Change-Id: I8e59039da78ecc9fb5415a10ff2a7c26ee689171
Closes-bug: #1796825

2019-04-10 10:06:40 +08:00

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