Add schema to apt configure config (#357)

Create a schema object for the `apt_configure` module and
validate this schema in the `handle`  function of the module.

There are some considerations regarding this PR:

* The `primary` and `security` keys have the exact same properties. I
  tried to eliminate this redundancy by moving their properties to a
  common place and then just referencing it for both security and
  primary. Similar to what is documented here:
    https://json-schema.org/understanding-json-schema/structuring.html
  under the `Reuse` paragraph.  However, this approach does not work,
  because the `#` pointer goes to the beginning of the file, which is
  a python module instead of a json file, not allowing the pointer to
  find the correct definition. What I did was to create a separate dict
  for the mirror config and reuse it for primary and security, but
  maybe there are better approaches to do that.
* There was no documentation for the config `debconf_selections`. I
  tried to infer what it supposed to do by looking at the code and the
  `debconf-set-selections`  manpage, but my description may not be
  accurate or complete.
* Add a _parse_description function to schema.py to render multi-line
  preformatted content instead of squashing all whitespace

LP: #1858884

1 files changed, 37 insertions, 36 deletions

diff --git a/tests/cloud_tests/testcases/examples/install_run_chef_recipes.yaml b/tests/cloud_tests/testcases/examples/install_run_chef_recipes.yaml
index 0bec305e..68ca95b5 100644
--- a/tests/cloud_tests/testcases/examples/install_run_chef_recipes.yaml
+++ b/tests/cloud_tests/testcases/examples/install_run_chef_recipes.yaml
@@ -8,43 +8,44 @@ cloud_config: |
   #cloud-config
   # Key from https://packages.chef.io/chef.asc
   apt:
-    source1:
-      source: "deb http://packages.chef.io/repos/apt/stable $RELEASE main"
-      key: |
-        -----BEGIN PGP PUBLIC KEY BLOCK-----
-        Version: GnuPG v1.4.12 (Darwin)
-        Comment: GPGTools - http://gpgtools.org
+    sources:
+      source1:
+        source: "deb http://packages.chef.io/repos/apt/stable $RELEASE main"
+        key: |
+          -----BEGIN PGP PUBLIC KEY BLOCK-----
+          Version: GnuPG v1.4.12 (Darwin)
+          Comment: GPGTools - http://gpgtools.org
 
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   chef: