Prompt for password on stack create.

Providing a password is now mandatory during stack create.

Fixes bug: #1199549

Change-Id: I649605c8472e77966b8075e03e096f3942fe1dff
Pinning minimum pbr and d2to1 versions

Fixes: bug #1199923

Change-Id: I14af1320c0ba5e397489f3de697ae6e87d1ad00b
Merge "Pinning minimum pbr and d2to1 versions"
Merge "Prompt for password on stack create."