Fix savanna-dashboard git repo clone dest

It breaks savanna d-g jobs due to the ERROR_ON_CLONE=True in d-g
(enforce that nothing will be cloned during the installation).

Change-Id: I0531e1baf7252c31eb63ee5b46c28d1dfa7d0a1b
Generate glance image with SCSI bus type for ppc arch

This patch fixes wrong assumptions for bus types of disk and cdrom
on ppc64. Qemu driver assumes IDE bus type for cdrom device, which
is not supported on ppc arch.
Adds capability to add --property key-value to the glance
image-create command.
Using double brackets for portability reasons.

Change-Id: I9f55fa0b6a894a93926e4f8c3d0ea410b5283f9c
Merge "Fix savanna-dashboard git repo clone dest"
Merge "Generate glance image with SCSI bus type for ppc arch"