add download_file function in devstack plugin.sh

Registered by sven mark

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 other else to avoid the probem.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
sven mark
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
sven mark

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