latest job result: move code that updates latest job link

The `update_latest_job_logs_dir` is defined in the `data_dir` module
but it's only used in the `job` module. So, let's keep this code right
at where it's used.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

avocado/core/data_dir.py

@@ -223,24 +223,6 @@ def create_job_logs_dir(logdir=None, unique_id=None):
     return debugdir
 
 
-def update_latest_job_logs_dir(job_result_dir):
-    """
-    Update the latest job result symbolic link [avocado-logs-dir]/latest.
-
-    :param job_result_dir: full path for the current job result.
-    """
-    basedir = os.path.dirname(job_result_dir)
-    basename = os.path.basename(job_result_dir)
-    latest = os.path.join(basedir, "latest")
-    if os.path.exists(latest) and not os.path.islink(latest):
-        raise OSError('"%s" already exists and is not a symlink' % latest)
-    try:
-        os.unlink(latest)
-    except OSError:
-        pass
-    os.symlink(basename, latest)
-
-
 class _TmpDirTracker(Borg):
 
     def __init__(self):

avocado/core/job.py

@@ -141,7 +141,19 @@ class Job(object):
             id_file_obj.write("%s\n" % self.unique_id)
 
     def _update_latest_link(self):
-        data_dir.update_latest_job_logs_dir(self.logdir)
+        """
+        Update the latest job result symbolic link [avocado-logs-dir]/latest.
+        """
+        basedir = os.path.dirname(self.logdir)
+        basename = os.path.basename(self.logdir)
+        latest = os.path.join(basedir, "latest")
+        if os.path.exists(latest) and not os.path.islink(latest):
+            raise OSError('"%s" already exists and is not a symlink' % latest)
+        try:
+            os.unlink(latest)
+        except OSError:
+            pass
+        os.symlink(basename, latest)
 
     def _start_sysinfo(self):
         if hasattr(self.args, 'sysinfo'):