Check either X_HTTP_API_ROLE or X_HTTP_ROLE for user_visible

Currenlty neutron requests come with X_HTTP_API_ROLE and
with the multi_tenancy set to false this field is not
converted to X_HTTP_ROLE. X_HTTP_ROLE is used internally
to check the permissions.

Partial-Bug: #1377139
(cherry picked from commit 65b1aa3334c97b41ed74c599728dc1272cfe5d19)

Conflicts:
	ifmap_frontend.py

Change-Id: I11a853ec617b19a76bfc1334a1196ec83ee0a856