Fetch deployment vms in parallel for instances command
Fetch deployment vms in parallel for instances command

[#145037925]( https://www.pivotaltracker.com/story/show/145037925)

Signed-off-by: Yulia Gaponenko <4e1e642fe1866b37c57d72b7676d11bb58a731a1@de.ibm.com>

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