Make --results-file stdout implied if unspecified when using a results formatter.
Make --results-file stdout implied if unspecified when using a results formatter.

Also cleans up pylint warnings (stock settings) in the modified function.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@254546 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb