Fix debug output for SSLMiddleware X-Forwarded-Proto
Fix debug output for SSLMiddleware X-Forwarded-Proto

Before this patch debug output was excessive.
Now print the line log if wsgi.url_scheme differ and

Change-Id: I925a7dd0844dfa76696b75e9f818d1bb47b34928
Closes-Bug: #1605806

openstack/murano,openstack/murano