oeqa/runtime/rpm: Drop log message counting test component

This test is flawed since multiple parts of the system can write to the log
and we obtain different numbers of log messages depending on factors we
can't control.

Drop the log testing component of the test.

[YOCTO #12465]

(From OE-Core rev: 2ad815dbafda0b90f5164f05d22dbbc26cb53f13)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/cases/rpm.py

@@ -141,13 +141,4 @@ class RpmInstallRemoveTest(OERuntimeTestCase):
 
         self.tc.target.run('rm -f %s' % self.dst)
 
-        # if using systemd this should ensure all entries are flushed to /var
-        status, output = self.target.run("journalctl --sync")
-        # Get the amount of entries in the log file
-        status, output = self.target.run(check_log_cmd)
-        msg = 'Failed to get the final size of the log file.'
-        self.assertEqual(0, status, msg=msg)
 
-        # Check that there's enough of them
-        self.assertGreaterEqual(int(output), 80,
-                                   'Cound not find sufficient amount of rpm entries in /var/log/messages, found {} entries'.format(output))