The usage of 'norm_ns' via identifier is deprecated for
removal. And there is no usage of norm_ns in other
projects [1]. It's safe to remove it now.
[1] http://codesearch.openstack.org/?q=norm_ns&i=nope&files=&repos=
Change-Id: I9dc7683cb2cfa9096c16b888518581ed57c6dd9d