Remove KarafIniWebEnvironmentLoaderListener to avoid deadlock at org.opendaylight.aaa.shiro.web.env.KarafIniWebEnvironment.init() CompletableFuture.get

Following https://git.opendaylight.org/gerrit/#/c/69415/ (I think), and in development of https://git.opendaylight.org/gerrit/#/c/68767/ Patch Set 5 after having gotten AAA-170 out of the way, the SFT of odl-neutron-service deadlocks (see attached x3 jstack*.txt) in org.opendaylight.aaa.shiro.web.env.KarafIniWebEnvironment.init() when waiting for CompletableFuture.get, without any other relevant errors in karaf.log.

Before anyone (Ryan) jumps in and starts reverting stuff, and because this is only seen in a not yet merged in dev Gerrit in Neutron, we should better understand what is really going on here - because AAA itself does seem to work; I suspect I may have made a mistake in Neutron, but I don't see which.