Create user accounts for server components in smoke tests

Add users for kube-controller-manager, kube-scheduler and
konnectivity-server in footloose-alpine docker image so those process
runs as non-root.

Signed-off-by: Natanael Copa <ncopa@mirantis.com>

inttest/footloose-alpine/Dockerfile

@@ -18,7 +18,7 @@ RUN echo "#!/bin/sh" > /etc/local.d/machine-id.start \
        && echo "fi" >> /etc/local.d/machine-id.start \
        && chmod +x /etc/local.d/machine-id.start
 
-RUN for i in etcd kube-apiserver; do \
+RUN for i in etcd kube-apiserver kube-controller-manager kube-scheduler konnectivity-server; do \
         adduser -H -S -s /sbin/nologin $i; \
     done