Continuation broken for Python scripts when using non-interactive input (Xcode for example). 

The problem was the read_func we were supplying to the interactive interpreter wasn't stripping the newline from the end of the string. Now it does and multi-line python scripts can be typed in Xcode.

<rdar://problem/17696438>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@217843 91177308-0d34-0410-b5e6-96231b3b80d8