bitbake: lib: remove unused imports

removed unused imports which made the code harder to read, and slightly
but less efficient

(Bitbake rev: 4367692a932ac135c5aa4f9f2a4e4f0150f76697)

Signed-off-by: Frazer Clews <frazer.clews@codethink.co.uk>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bs4/tests/test_tree.py

@@ -9,16 +9,12 @@ same markup, but all Beautiful Soup trees can be traversed with the
 methods tested here.
 """
 
-from pdb import set_trace
 import copy
 import pickle
 import re
 import warnings
 from bs4 import BeautifulSoup
-from bs4.builder import (
-    builder_registry,
-    HTMLParserTreeBuilder,
-)
+from bs4.builder import builder_registry
 from bs4.element import (
     PY3K,
     CData,
@@ -29,10 +25,7 @@ from bs4.element import (
     SoupStrainer,
     Tag,
 )
-from bs4.testing import (
-    SoupTest,
-    skipIf,
-)
+from bs4.testing import SoupTest
 
 XML_BUILDER_PRESENT = (builder_registry.lookup("xml") is not None)
 LXML_PRESENT = (builder_registry.lookup("lxml") is not None)