Fixed output to display correctly for "command source" by fixing the correct flags being set.

Also emit the "Executing commands" message so it properly only comes out when desired and so it comes out in the right place.

<rdar://problem/15992208>



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@200875 91177308-0d34-0410-b5e6-96231b3b80d8