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)
538b1bf7bad12'/><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=e090b97f57c4c66af6de64c4d10538b1bf7bad12'>root</a>/<a href='/guix/log/etc?id=e090b97f57c4c66af6de64c4d10538b1bf7bad12'>etc</a>/<a href='/guix/log/etc/guix-gc.timer?id=e090b97f57c4c66af6de64c4d10538b1bf7bad12'>guix-gc.timer</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/etc/guix-gc.timer?id=e090b97f57c4c66af6de64c4d10538b1bf7bad12&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-09-20 14:18:21 +0000'>2021-09-20</span></td><td><a href='/guix/commit/etc/guix-gc.timer?id=5c4fd77097e2cecfd4780e099af7954f86779fe1'>etc: Add systemd files for running ‘guix gc’ periodically</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-gc.service.in: New file.
* etc/guix-gc.timer: Likewise.
* .gitignore: Ignore generated ‘guix-gc.service’.
* nix/local.mk (nodist_systemdservice_DATA): Add ‘guix-gc.service’ and
‘guix-gc.timer’.
(EXTRA_DIST): Add ‘guix-gc.service.in’ and ‘guix-gc.timer’.
* doc/guix.texi (Binary Installation): Mention the new systemd files.

Signed-off-by: Mathieu Othacehe &lt;othacehe@gnu.org&gt;
</span></span></td><td>Thiago Jung Bauermann</td></tr>