interface: Introduce a method to set the name.

The name field of the interface is set in different ways by different
callers.  In order to prevent users from open coding the logic that sets
the name, this patch adds an appropriate method.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>

interface.c

@@ -27,3 +27,8 @@ const char *interface_name(struct interface *iface)
 {
 	return iface->name;
 }
+
+void interface_set_name(struct interface *iface, const char *name)
+{
+	strncpy(iface->name, name, MAX_IFNAME_SIZE);
+}

interface.h

@@ -53,5 +53,11 @@ const char *interface_label(struct interface *iface);
  */
 const char *interface_name(struct interface *iface);
 
-#endif
+/**
+ * Set the name of a given interface.
+ * @param iface  The interface of interest.
+ * @param name   The desired name for the interface.
+ */
+void interface_set_name(struct interface *iface, const char *name);
 
+#endif