base: Add lsof for healthcheck_socket

healthcheck_socket script requires lsof to check pids of processes
using that socket - that's needed for octavia-driver-agent healthchecks
in Kolla-Ansible.

Change-Id: I0f14c0f67fd81f13c58f231f800829ad759cc54c

docker/base/Dockerfile.j2

@@ -254,6 +254,7 @@ RUN {{ macros.install_packages(base_centos_yum_repo_packages | customizable("cen
         'hostname',
         'iproute',
         'iscsi-initiator-utils',
+        'lsof',
         'lvm2',
         'ncurses',
         'procps-ng',
@@ -325,6 +326,7 @@ COPY apt_preferences /etc/apt/preferences.d/kolla-custom
    'gawk',
    'iproute2',
    'kmod',
+   'lsof',
    'lvm2',
    'netbase',
    'open-iscsi',