Add name and uri helpers to Backend

Providing helper functions for the commonly used parts of the server makes
code easier to read. It also removes any possibility for formatting
problems by moving the URI and name string handling inside the Backend
class.

server/core/backend.cc

@@ -12,6 +12,9 @@
  */
 
 #include <maxscale/backend.hh>
+
+#include <sstream>
+
 #include <maxscale/protocol/mysql.h>
 #include <maxscale/debug.h>
 
@@ -23,6 +26,9 @@ Backend::Backend(SERVER_REF *ref):
     m_dcb(NULL),
     m_state(0)
 {
+    std::stringstream ss;
+    ss << "[" << server()->name << "]:" << server()->port;
+    m_uri = ss.str();
 }
 
 Backend::~Backend()
@@ -298,3 +304,13 @@ bool Backend::has_failed() const
 {
     return m_state & FATAL_FAILURE;
 }
+
+const char* Backend::name() const
+{
+    return m_backend->server->unique_name;
+}
+
+const char* Backend::uri() const
+{
+    return m_uri.c_str();
+}