[feature] add creation time to alloc-status

[camerondavison]

comment in #1540 mentioned that we should add Created At time to alloc-status

for

nomad alloc-status e8f73ba0

under

ID              = e8f73ba0-875d-013c-97c1-c11af4bacf6a
Eval ID         = 25673e8e-e34a-0ff1-81a2-8125eb851615
Name            = redis.service[0]
Node ID         = f082b9b0-8962-30ac-e64f-934adc4e0d6b
Job ID          = redis
Client Status   = running

add

Created = 07/25/16 17:20:35 UTC

make sure that it also shows up in the -verbose argument

[github-actions]

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