bump atc
bump atc

[finishes #114162873]

Submodule src/github.com/concourse/atc 0ce2a52..eff7fc3:
  > wait for task process to finish in exec
  > reformat

Signed-off-by: Evan Short <5b1db704470d35a058f1f4a9e1a5a172a6ea69d3@pivotal.io>

cjcjameson/concourse,concourse/concourse,cjcjameson/concourse,cjcjameson/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse