avocado.core.tree: Match whole key in filters.

When filtering nodes, use the whole key for comparing.

So if you have /long and /longest and you're filtering for /long,
then it will match /long alone.

The previous behaviour was using the partial
string match, so both /long and /longest were being returned,
which is wrong.
Signed-off-by: NRudá Moura <rmoura@redhat.com>

avocado/core/tree.py

@@ -275,16 +275,16 @@ def apply_filters(tree, filter_only=[], filter_out=[]):
         for path in filter_only:
             if path == '':
                 continue
-            if node.path.startswith(path):
+            if node.path == path:
                 keep_node = True
                 break
-            if node.parent and node.parent.path.startswith(path_parent(path)):
+            if node.parent and node.parent.path == path_parent(path):
                 keep_node = False
                 continue
         for path in filter_out:
             if path == '':
                 continue
-            if node.path.startswith(path):
+            if node.path == path:
                 keep_node = False
                 break
         if not keep_node: