avocado.remote.runner: Remove usage of os.path.relpath

Python 2.6's os.path.relpath function returns some funny
results, such as:

In [3]: os.path.relpath('/tmp', '/')
Out[3]: '../tmp'

So let's skip relpath entirely.

Changes from v1:
 * Per ldoktor's suggestion use lstrip('/') instead of
   relpath workarounds.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

avocado/remote/runner.py

@@ -99,7 +99,8 @@ class RemoteTestRunner(TestRunner):
         for t_dict in json_result['tests']:
             logdir = os.path.dirname(self.result.stream.debuglog)
             logdir = os.path.join(logdir, 'test-results')
-            logdir = os.path.join(logdir, os.path.relpath(t_dict['url'], '/'))
+            relative_path = t_dict['url'].lstrip('/')
+            logdir = os.path.join(logdir, relative_path)
             t_dict['logdir'] = logdir
             t_dict['logfile'] = os.path.join(logdir, 'debug.log')
 

selftests/all/unit/avocado/remote_unittest.py

@@ -18,10 +18,10 @@ JSON_RESULTS = ('Something other than json\n'
                 '"status": "PASS", "time": 1.23, "start": 0, "end": 1.23}],'
                 '"debuglog": "/home/user/avocado/logs/run-2014-05-26-15.45.'
                 '37/debug.log", "errors": 0, "skip": 0, "time": 1.4, '
-                '"logdir": "/local/path/test-results%s/sleeptest", '
-                '"logdir": "/local/path/test-results%s/sleeptest", '
+                '"logdir": "/local/path/test-results/sleeptest", '
+                '"logdir": "/local/path/test-results/sleeptest", '
                 '"start": 0, "end": 1.4, "pass": 1, "failures": 0, "total": '
-                '1}\nAdditional stuff other than json' % (cwd, cwd))
+                '1}\nAdditional stuff other than json')
 
 
 class RemoteTestRunnerTest(unittest.TestCase):
@@ -63,9 +63,8 @@ class RemoteTestRunnerTest(unittest.TestCase):
                 'tagged_name': u'sleeptest.1', 'time_elapsed': 1.23,
                 'fail_class': 'Not supported yet', 'job_unique_id': '',
                 'fail_reason': 'None',
-                'logdir': '/local/path/test-results%s/sleeptest' % cwd,
-                'logfile': '/local/path/test-results%s/sleeptest/debug.log' %
-                           cwd}
+                'logdir': '/local/path/test-results/sleeptest',
+                'logfile': '/local/path/test-results/sleeptest/debug.log'}
         Results.should_receive('start_test').once().with_args(args).ordered()
         Results.should_receive('check_test').once().with_args(args).ordered()
         (Remote.should_receive('receive_files')