Support for str in StrEnum.

The StrEnum class has been modified to accept str value and convert
it into unicode. This is to fix encoding issue on F14.

ipalib/parameters.py

@@ -1384,6 +1384,24 @@ class StrEnum(Enum):
 
     type = unicode
 
+    def _convert_scalar(self, value, index=None):
+        """
+        Convert a single scalar value.
+        """
+        if type(value) is self.type:
+            return value
+        if type(value) is str:
+            try:
+                return value.decode('utf-8')
+            except UnicodeDecodeError:
+                raise ConversionError(
+                    name=self.name, index=index,
+                    error=ugettext(self.scalar_error)
+                )
+        raise ConversionError(name=self.name, index=index,
+            error=ugettext(self.type_error),
+        )
+
 
 class List(Param):
     """