Install curl for EL8 only
Install curl for EL8 only

In CentOS stream9 and UBI 9 image, curl-minimal is already
installed in the image.

The curl installation conflicts with curl-minimal package.
So we are restricting curl installation to cs8 only.

Closes-Bug: #1953156

Signed-off-by: Chandan Kumar (raukadah) <37614c4f126be5146599b9d19fe2ba37ae0ea495@redhat.com>
Change-Id: I8da32dcfcba243b7cecfee0f1a6e423ee1dbd8fb

openstack/tripleo-common,openstack/tripleo-common