tests: remove unused required tools

The original mercurial test use much more stuff than us.

tests/run-tests.py

@@ -74,7 +74,7 @@
 if 'java' in sys.platform:
     IMPL_PATH = 'JYTHONPATH'
 
-requiredtools = ["python", "diff", "grep", "unzip", "gunzip", "bunzip2", "sed"]
+requiredtools = ["python", "diff", "grep", "sed"]
 
 defaults = {
     'jobs': ('HGTEST_JOBS', 1),