Ensure that dhclient is installed

It appears that on Jammy, it isn't installed by default.

    Traceback (most recent call last):
      File "/opt/stack/tempest/.tox/venv/lib/python3.10/site-packages/oslo_config/cfg.py", line 2931, in _do_get
        return (convert(val), alt_loc)
      File "/opt/stack/tempest/.tox/venv/lib/python3.10/site-packages/oslo_config/cfg.py", line 2900, in convert
        return self._convert_value(
      File "/opt/stack/tempest/.tox/venv/lib/python3.10/site-packages/oslo_config/cfg.py", line 3028, in _convert_value
        return opt.type(value)
      File "/opt/stack/tempest/.tox/venv/lib/python3.10/site-packages/oslo_config/types.py", line 167, in __call__
        raise ValueError(
    ValueError: Valid values are [udhcpc, dhclient, ], but found 'dhcpcd'

networking-calico/devstack/bootstrap.sh

@@ -104,9 +104,9 @@ cd
 mkdir -p devstack-bootstrap
 cd devstack-bootstrap
 
-# Ensure that Git is installed.
+# Ensure that Git and dhclient are installed.
 sudo apt-get update
-sudo apt-get -y install git
+sudo apt-get -y install git isc-dhcp-client
 
 # Enable IPv4 and IPv6 forwarding.
 sudo sysctl -w net.ipv4.ip_forward=1