Pylint Fixes

Update our version of pylint to use the latest version and update the
codebase to comply with the majority of the updates.

For now disable the additional checks for `super-with-arguments`,
`useless-object-inheritance`, `raise-missing-from`, `no-else-raise`,
`no-else-break`, `no-else-continue` to be consistent with the existing
codebase.

wa/framework/host.py

@@ -50,6 +50,7 @@ def init_user_directory(overwrite_existing=False):  # pylint: disable=R0914
         # If running with sudo on POSIX, change the ownership to the real user.
         real_user = os.getenv('SUDO_USER')
         if real_user:
+            # pylint: disable=import-outside-toplevel
             import pwd  # done here as module won't import on win32
             user_entry = pwd.getpwnam(real_user)
             uid, gid = user_entry.pw_uid, user_entry.pw_gid