Update single-node KUD installation variables

Update single-node KUD installation variables

Single host installation requires some kubespray variables defined
differently from what is currently defined by default. All-in-one
installation script has been updated to provide these differences.
CI-building script has been updated and removed applying variables
there, as it's not specific just for CI, but for every single-node
installation.

Issue-ID: MULTICLOUD-1093
Signed-off-by: Konrad Bańka <k.banka@samsung.com>
Change-Id: I26c1835d87df41c087b8dfff9f52095083b6c160