add download_file function in devstack plugin.sh

Registered by sven mark on 2017-02-22

add download_file function in devstack plugin.sh,to avoid filedownloaded repeated.
when unstack the spark download dir is rm from fs,and file downloaded is removed
too. when start stack.sh ,the file is download again, so move spark download dir to
devstack default files dir to avoid the probem.

Blueprint information

Status:
Started
Approver:
None
Priority:
Undefined
Drafter:
sven mark
Direction:
Needs approval
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None
Definition:
Pending Approval
Series goal:
None
Implementation:
Slow progress
Milestone target:
None
Started by
sven mark on 2017-02-23

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Gerrit topic: https://review.openstack.org/#q,topic:bp/add-downloadfile-function,n,z

Addressed by: https://review.openstack.org/437215
    add download_file function in devstack plugin.sh

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