Added several gdb-remote tests around QListThreadsInStopReply.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@210982 91177308-0d34-0410-b5e6-96231b3b80d8
Merge upstream llvm.org r210982 into dev-tfiala-native-protocol-linux-x86_64
Added QListThreadsInStopReply support to llgs.