[201811][utilities] advance utilities submodule head (#3724)

Submodule src/sonic-utilities 2ca1ae1..3ed25a4:
  > Do not start pfcwd for M0 devices (#726)
  > Make configlet application script idempotent for updates. (#728)

Signed-off-by: Ying Xie <ying.xie@microsoft.com>