[2175976] "Select InstanceType" should show the volume's default instanceType

Description of problem:
While adding a volume, user can set the default instanceType.
If the volume is selected in the step "Select volume to boot from", the default value should be showing in "Select InstanceType", so user don't have to set it again unless user want to change the value.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Add a volume and set default instanceType
2. Select this volume
3.

Actual results:
No instanceType is selected at step 2 "Select InstanceType"

Expected results:
The default instanceType of the volume is selected in step 2.

Additional info: