[NEXUS-6767] Do automatic anonymous sign-on on all requests not only on status request

https://issues.sonatype.org/browse/NEXUS-6767
http://bamboo.s/browse/NX-OSSF236

Problem was that as we only did the automatic anonymous sign-on only on status request other requests that were done prior to status, such as retrieving permissions, were done without anonymous user being signed in