Add Loader argument to 'yaml.load' invocations as required by PyYAML 6.0.

Submitted upstream:

  https://github.com/ganeti/ganeti/pull/1668

diff --git a/qa/qa_utils.py b/qa/qa_utils.py
index da485df48..27428e685 100644
--- a/qa/qa_utils.py
+++ b/qa/qa_utils.py
@@ -450,7 +450,7 @@ def GetObjectInfo(infocmd):
   master = qa_config.GetMasterNode()
   cmdline = utils.ShellQuoteArgs(infocmd)
   info_out = GetCommandOutput(master.primary, cmdline)
-  return yaml.load(info_out)
+  return yaml.load(info_out, Loader=yaml.SafeLoader)
 
 
 def UploadFile(node, src):
diff --git a/test/py/ganeti.cli_unittest.py b/test/py/ganeti.cli_unittest.py
index 9cc980afa..242aac9fd 100755
--- a/test/py/ganeti.cli_unittest.py
+++ b/test/py/ganeti.cli_unittest.py
@@ -1141,14 +1141,15 @@ class TestFormatPolicyInfo(unittest.TestCase):
           self._RenameDictItem(minmax, key, keyparts[0])
     self.assertTrue(constants.IPOLICY_DTS in parsed)
     parsed[constants.IPOLICY_DTS] = yaml.load("[%s]" %
-                                              parsed[constants.IPOLICY_DTS])
+                                              parsed[constants.IPOLICY_DTS],
+                                              Loader=yaml.SafeLoader)
 
   @staticmethod
   def _PrintAndParsePolicy(custom, effective, iscluster):
     formatted = cli.FormatPolicyInfo(custom, effective, iscluster)
     buf = StringIO()
     cli._SerializeGenericInfo(buf, formatted, 0)
-    return yaml.load(buf.getvalue())
+    return yaml.load(buf.getvalue(), Loader=yaml.SafeLoader)
 
   def _PrintAndCheckParsed(self, policy):
     parsed = self._PrintAndParsePolicy(policy, NotImplemented, True)
uix-git-authenticate.sh'>
<input type='hidden' name='id' value='05044a54468e091ead1dfa24662df02cd0929ad8'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=05044a54468e091ead1dfa24662df02cd0929ad8'>root</a>/<a href='/guix/log/tests?id=05044a54468e091ead1dfa24662df02cd0929ad8'>tests</a>/<a href='/guix/log/tests/guix-git-authenticate.sh?id=05044a54468e091ead1dfa24662df02cd0929ad8'>guix-git-authenticate.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-git-authenticate.sh?id=05044a54468e091ead1dfa24662df02cd0929ad8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-04-21 16:16:38 +0200'>2023-04-21</span></td><td><a href='/guix/commit/tests/guix-git-authenticate.sh?id=37dd69b44511dc73eb04bdebe8d82c9a0386338e'>tests: Fix checks for expected failures.</a><span class='msg-avail'>...<span class='msg-tooltip'>Addresses &lt;https://issues.guix.gnu.org/62406&gt;.

With 'set -e', a return status inverted with '!' does not cause the shell to
exit immediately.  Instead use '&amp;&amp; false' to indicate an expected failure.

* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh,
tests/guix-environment-container.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-home.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh, tests/guix-refresh.sh, tests/guix-shell.sh,
tests/guix-style.sh, tests/guix-system.sh: Replace uses of '! ...' with
'... &amp;&amp; false' or `test ! ...` as appropriate.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2022-02-14 11:23:08 +0100'>2022-02-14</span></td><td><a href='/guix/commit/tests/guix-git-authenticate.sh?id=ca87601dd97dd9d356409827802eb0f8a3a535f0'>git-authenticate: Ensure the target is a descendant of the introductory commit.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes a bug whereby authentication of a commit *not* descending from the
introductory commit could succeed, provided the commit verifies the
authorization invariant.

In the example below, A is a common ancestor of the introductory commit
I and of commit X.  Authentication of X would succeed, even though it is
not a descendant of I, as long as X is authorized according to the
'.guix-authorizations' in A:

   X   	 I
    \   /
      A

This is because, 'authenticate-repository' would not check whether X
descends from I, and the call (commit-difference X I) would return X.

In practice that only affects forks because it means that ancestors of
the introductory commit already contain a '.guix-authorizations' file.

* guix/git-authenticate.scm (authenticate-repository): Add call to
'commit-descendant?'.
* tests/channels.scm ("authenticate-channel, not a descendant of introductory commit"):
New test.
* tests/git-authenticate.scm ("authenticate-repository, target not a descendant of intro"):
New test.
* tests/guix-git-authenticate.sh: Expect earlier test to fail since
9549f0283a78fe36f2d4ff2a04ef8ad6b0c02604 is not a descendant of
$intro_commit.  Add new test targeting an ancestor of the introductory
commit, and another test targeting the v1.2.0 commit.
* doc/guix.texi (Specifying Channel Authorizations): Add a sentence.
</span></span></td><td>Ludovic Courtès</td></tr>