images: add python3-pcp for RHEL images

The Python rewrite of cockpit-pcp is underway and to help development
and testing add the new runtime dependency.

images/scripts/rhel.setup

@@ -182,6 +182,7 @@ openssl \
 PackageKit \
 pcp-libs \
 pcp \
+python3-pcp \
 podman \
 realmd \
 redhat-logos \
@@ -248,6 +249,11 @@ if [ "${IMAGE#rhel-8*}" != "$IMAGE" ]; then
     TEST_PACKAGES="${TEST_PACKAGES/wireguard-tools /}"
 fi
 
+# RHEL 8 still uses the C pcp bridge 
+if [ "${IMAGE#rhel-8*}" != "$IMAGE" ]; then
+    COCKPIT_DEPS="${COCKPIT_DEPS/python3-pcp /}"
+fi
+
 # vdo not available on centos/rhel 10
 if  [ "$IMAGE" = "centos-10" ] || [ "${IMAGE#rhel-10}" != "$IMAGE" ]; then
     TEST_PACKAGES="${TEST_PACKAGES/ kmod-kvdo / }"