Rename cli created at column to vm created at
Rename cli created at column to vm created at

[#147867865](https://www.pivotaltracker.com/story/show/147867865)

Signed-off-by: Difan Zhao <d4b657a67385123ddb690ebdb0d79b9c6cd38927@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh