lib/oeqa/runtime: cleanup and improve output readability for some tests

- move everything in the same test. setUp/tearDown aren't quite
the right thing here, everything it's part of the same test. (and
it get's confusing when ssh fails)

ldd:
   - change test name and add output to error message

vnc:
   - remove unnecessary check as there is no point in doing
both ps and netstat. Also improve error output a bit.

(From OE-Core rev: 2f91bb438cfcdd0a40daed5902b6e98fc0aee67f)

Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/date.py

@@ -4,13 +4,12 @@ import re
 
 class DateTest(oeRuntimeTest):
 
-    def setUp(self):
-        (status, output) = self.target.run('date +"%Y-%m-%d %T"')
-        self.assertEqual(status, 0, msg="Failed to get initial date, output: %s" % output)
-        self.oldDate = output
-
     @skipUnlessPassed("test_ssh")
     def test_date(self):
+        (status, output) = self.target.run('date +"%Y-%m-%d %T"')
+        self.assertEqual(status, 0, msg="Failed to get initial date, output: %s" % output)
+        oldDate = output
+
         sampleDate = '"2016-08-09 10:00:00"'
         (status, output) = self.target.run("date -s %s" % sampleDate)
         self.assertEqual(status, 0, msg="Date set failed, output: %s" % output)
@@ -19,6 +18,5 @@ class DateTest(oeRuntimeTest):
         p = re.match('Tue, 09 Aug 2016 10:00:.. \+0000', output)
         self.assertTrue(p, msg="The date was not set correctly, output: %s" % output)
 
-    def tearDown(self):
-        (status, output) = self.target.run('date -s "%s"' % self.oldDate)
+        (status, output) = self.target.run('date -s "%s"' % oldDate)
         self.assertEqual(status, 0, msg="Failed to reset date, output: %s" % output)