Fix pylint warnings introduced by the submodule patch "69998b0 Represent git-submodule as nested projects" has introduced a few pylint warnings. W0612:1439,8:Project._GetSubmodules.get_submodules: Unused variable 'sub_gitdir' W0613:1424,36:Project._GetSubmodules.get_submodules: Unused argument 'path' W0612:1450,25:Project._GetSubmodules.parse_gitmodules: Unused variable 'e' W0622:516,8:Sync.Execute: Redefining built-in 'all' Change-Id: I84378e2832ed1b5ab023e394d53b22dcea799ba4