show pending updates as info instead of warning

tests/test_apt.py

@@ -49,8 +49,7 @@ def main():
     # detect pending upgrade
     upgradable = len(apt.upgradable_packages)
     if upgradable:
-        u.warning("there is {} upgrade pending".format(upgradable))
-        warnings += 1
+        u.info("there is {} upgrade pending".format(upgradable))
     else:
         u.success("system up-to-date")