Removing sleep time in between reimage command issue.
Removing sleep time in between reimage command issue.

Removing the sleep introduced between issue of reimage commands,
because this bug is fixed in server-manager R2.20. This sleep should
no longer be needed going forward.

Closes-Bug: #1461512

Change-Id: I1256a3c86dd5196a06f4b04ac4ff65309eec5565

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils