Fixed SBDebugger.CreateTarget("filename") and also make sure remote targets don't pickup bogus locally cached files.

<rdar://problem/16217254>
<rdar://problem/16078651>



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@202890 91177308-0d34-0410-b5e6-96231b3b80d8