Fix cell(User Name) inline edit with a link in user table

We implement user table inline edit and user detail, so the User Name
cell will show input element as text while edting inline because the
cell data will be escaped while the cell has url, the patch fix it.

Closes-Bug: 1410832
Change-Id: Ic249259961624cc52f54c53a8cceb9f1a439e9bf

horizon/tables/base.py

@@ -734,7 +734,7 @@ class Cell(html.HTMLElement):
             raise six.reraise(template.TemplateSyntaxError, exc_info[1],
                               exc_info[2])
 
-        if self.url:
+        if self.url and not self.column.auto == "form_field":
             link_attrs = ' '.join(['%s="%s"' % (k, v) for (k, v) in
                                   self.column.link_attrs.items()])
             # Escape the data inside while allowing our HTML to render