Use latest setuptools

The system installed setuptools is too old for some python
packages installed using pip, always get the latest version.

Also pin upper-constraints.

Signed-off-by: Riccardo Pittau <elfosardo@gmail.com>

prepare-image.sh

@@ -36,6 +36,9 @@ if [[ "$INSTALL_TYPE" == "source" ]]; then
     # shellcheck disable=SC2086
     dnf install -y python3-pip $BUILD_DEPS
     python3 -m pip install pip==21.3.1
+    # NOTE(elfosardo): default system setuptools is too old to install
+    # some python libraries, get the latest version
+    python3 -m pip install -U setuptools
 
     IRONIC_PKG_LIST_FINAL="/tmp/ironic-${INSTALL_TYPE}-list-final"