When creating node with bdm, we may create bdm first when it is not exist

Registered by EldonZhao on 2016-11-16

Now we create node using exist bdm as default. But sometimes, prople dont't create bdm in advance, so we should firstly check the bed we use is available.

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Drafter:
EldonZhao
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Need a design for this before working on it. I'm looking forward to a mechanism that can be used by network ports and fixed IPs as well.

Sounds like really a useful feature, please keep working on it. // Qiming

Thie feature operation as floown:

a) node create use has exist volume configure in BLOCK_DEVICE_MAPPING_V2
b) the BLOCK_DEVICE_MAPPING_V2 configure volume will be check
c) if check the volume has available, the node will be execute do_create operation. if the volume has in-use status, the node don't execute do_create operation.

(?)

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