Move PseudoTerminal to the lldb_private namespace

lldb_utility doesn't make sense, as it is no longer even living in the
"utility" module.

llvm-svn: 320346
diff --git a/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp b/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
index 6291d09..bd06fa2 100644
--- a/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
@@ -843,7 +843,7 @@
   const FileSpec &stderr_file_spec = args->m_stderr_file_spec;
   const FileSpec &working_dir = args->m_working_dir;
 
-  lldb_utility::PseudoTerminal terminal;
+  PseudoTerminal terminal;
   const size_t err_len = 1024;
   char err_str[err_len];
   ::pid_t pid;