bionic: cherry pick 4f62ae8

[OddBloke]

No description provided.

[blackboxsw]

LGTM:

1. tooling diff minor between authors:

diff --git a/debian/changelog b/debian/changelog
index 170dadba..79b21057 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -3,7 +3,7 @@ cloud-init (20.4-0ubuntu1~18.04.2) bionic; urgency=medium
   * cherry-pick 4f62ae8d: Fix regression with handling of IMDS ssh keys
     (#760) (LP: #1910835)
 
- -- Daniel Watkins <oddbloke@ubuntu.com>  Mon, 11 Jan 2021 17:31:19 -0500
+ -- Chad Smith <chad.smith@canonical.com>  Mon, 11 Jan 2021 15:25:54 -0700
 
 cloud-init (20.4-0ubuntu1~18.04.1) bionic; urgency=medium
 

2. build-package succeeds
3. sbuilt-it succeeds
4. quilt push -a/pop -a succeeds with appropriate functional diff

csmith@downtown:/tmp/cloud-init (ubuntu/bionic)$ git diff cloudinit/sources/DataSourceAzure.py
diff --git a/cloudinit/sources/DataSourceAzure.py b/cloudinit/sources/DataSourceAzure.py
index 04ff2131..647e3d28 100755
--- a/cloudinit/sources/DataSourceAzure.py
+++ b/cloudinit/sources/DataSourceAzure.py
@@ -651,6 +651,10 @@ class DataSourceAzure(sources.DataSource):
         LOG.debug('Retrieving public SSH keys')
         ssh_keys = []
         try:
+            raise KeyError(
+                "Not using public SSH keys from IMDS"
+            )
+            # pylint:disable=unreachable
             ssh_keys = [
                 public_key['keyData']
                 for public_key
@@ -1271,6 +1275,10 @@ class DataSourceAzure(sources.DataSource):
 
             pubkey_info = None
             try:
+                raise KeyError(
+                    "Not using public SSH keys from IMDS"
+                )
+                # pylint:disable=unreachable
                 public_keys = self.metadata['imds']['compute']['publicKeys']
                 LOG.debug(
                     'Successfully retrieved %s key(s) from IMDS',

[OddBloke]

I've confirmed this works using my test from #761.