Switch debugserver to detach on error by default, and change the flag to kill-on-error.
Also fix the bug where lldb prints: "Got a connection and launched debugserver" rather
than the name of the process it actually launched.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@202189 91177308-0d34-0410-b5e6-96231b3b80d8