tests: fix testTime and testTimeServers test regressions on debian-te…

…sting

On Debian timesyncd can't be started of any other NTP daemon is
installed.
See https://salsa.debian.org/systemd-team/systemd/commit/e1b3868e8b297a

Out test images have chrony installed as a dependency of freeipa-client,
so we need to remove that package before executing the NTP related
tests, since cockpit only works with timesyncd for NTP cponfiguration.

test/verify/check-system-info

@@ -57,6 +57,14 @@ def ssh_reconnect(machine, timeout_sec=120):
 
 
 class TestSystemInfo(MachineCase):
+    def setUp(self):
+        MachineCase.setUp(self)
+
+        # Debian will not allow timesyncd to start if any other NTP packge is installed
+        # We only support timesyncd for NTP configuration, so make sure chrony
+        # is not installed in the debian test images
+        if self.machine.image == "debian-testing":
+            self.machine.execute("dpkg --remove chrony");
 
     @enableAxe
     def testBasic(self):