Merge ~smoser/cloud-init:ubuntu/devel-1759307-add-depends-isc-dhcp-client into cloud-init:ubuntu/devel

[Scott Moser]

Add missing dependency on isc-dhcp-client.

This just correctly adds the missing dependency on isc-dhcp-client.
That package is used via 'dhclient' from cloudinit/net/dhcp.py.

LP: #1759307

see commit message

[Scott Moser (smoser)]

upstrem packaging merge proposal at
 https://code.launchpad.net/~smoser/cloud-init/+git/cloud-init/+merge/342215

[Server Team CI bot (server-team-bot)]

PASSED: Continuous integration, rev:5b630c3419c5e28946cd1cd58091d78e89df354a
https://jenkins.ubuntu.com/server/job/cloud-init-ci/935/
Executed test runs:
    SUCCESS: Checkout
    SUCCESS: Unit & Style Tests
    SUCCESS: Ubuntu LTS: Build
    SUCCESS: Ubuntu LTS: Integration
    SUCCESS: MAAS Compatability Testing
    IN_PROGRESS: Declarative: Post Actions

Click here to trigger a rebuild:
https://jenkins.ubuntu.com/server/job/cloud-init-ci/935/rebuild

review: Approve (continuous-integration)

diff --git a/debian/control b/debian/control
index 5e3a8ea..2eb0eaa 100644
--- a/debian/control
+++ b/debian/control
@@ -6,6 +6,7 @@ Build-Depends: debhelper (>= 9),
                dh-python,
                dh-systemd,
                iproute2,
+               isc-dhcp-client,
                pep8,
                po-debconf,
                pyflakes,