Fix : clang-10 issue for Networkd
Fix : clang-10 issue for Networkd

- Added `AfterCaseLabel: true` clang rule so that
  the clang-format check does not fail in version 10.

Signed-off-by: Manojkiran Eda <58c0f11b20f4eee4270d60d1871d69f99fda7b66@gmail.com>
Change-Id: Id19ba9afe9ae74847c98e2cf84e924d8dd671164

openbmc/phosphor-networkd,openbmc/phosphor-networkd