Listing as AAA bug, as this possibly is a consequence of work on NETCONF-107 by AAA devs.

This is a recent Beryllium bug. This bug is not triggered when features are installed via featuresBoot.
CSIT tests require restconf to be ready before tests are executed, so this has to be tested manually.

Here is what happens after starting karaf clean:

opendaylight-user@root>feature:install odl-aaa-authn
opendaylight-user@root>feature:install odl-restconf-noauth
Refreshing bundles org.eclipse.jetty.aggregate.jetty-all-server (175), com.google.guava (64), com.sun.jersey.servlet (201), net.sf.ehcache (204), org.eclipse.persistence.moxy (125), osgi.enterprise (214), com.sun.jersey.jersey-server (74), org.h2 (215), org.jboss.netty (160)
Error executing command: Can't install feature odl-restconf-noauth/0.0.0:
Could not start bundle mvn:org.opendaylight.netconf/sal-rest-connector/1.3.0-SNAPSHOT in feature(s) odl-restconf-noauth-1.3.0-SNAPSHOT: The bundle "org.opendaylight.netconf.sal-rest-connector_1.3.0.SNAPSHOT [236]" could not be resolved. Reason: Package uses conflict: Import-Package: com.google.common.base; version="[18.0.0,19.0.0)", Package uses conflict: Import-Package: com.google.common.collect; version="[18.0.0,19.0.0)", Package uses conflict: Import-Package: com.google.common.eventbus; version="[18.0.0,19.0.0)", Package uses conflict: Import-Package: com.google.common.util.concurrent; version="[18.0.0,19.0.0)", Package uses conflict: Import-Package: org.opendaylight.controller.md.sal.common.api.data; version="[1.3.0,2.0.0)", Package uses conflict: Import-Package: org.opendaylight.controller.md.sal.dom.api; version="[1.3.0,2.0.0)", Package uses conflict: Import-Package: org.opendaylight.controller.md.sal.dom.spi; version="[1.3.0,2.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.concepts; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.api; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.api.schema; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.api.schema.stream; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.api.schema.tree; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.impl.codec.xml; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.impl.schema; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.impl.schema.transform; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.data.impl.schema.transform.dom.parser; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.model.api; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.model.util; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.parser.builder.impl; version="[0.8.0,1.0.0)", Package uses conflict: Import-Package: org.opendaylight.yangtools.yang.parser.impl; version="[0.8.0,1.0.0)"

odl-restconf behaves in the same way as odl-restconf-noauth.
If restconf is installed first, no error appears.