Re-enable tests disabled due to llvm.org/pr14541
- "platform process list" command works on Linux now
- "process attach -n" (attach to process by name also works on Linux now)



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181905 91177308-0d34-0410-b5e6-96231b3b80d8