[201811][utilities] advance sub module head

Submodule src/sonic-utilities f76fc2c..fe2c656:
  > [warm-reboot]: Do not clean up mirror session state database (sonic-net#639)
  > [config] Reset failed status of all SONiC services, whether or not they are currently failed (sonic-net#619)

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