[NEXUS-5953] Replace EventBus.Managed with self registration in constructor

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
[NEXUS-5953] Replace constructor injection with setter injection in CapabilityBooterSupport

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
[NEXUS-5953] Use latest goodies eventbus (1.8-SNAPSHOT)

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge remote-tracking branch 'origin/master' into NEXUS-5953-remove-eventbus-managed
Merge remote-tracking branch 'origin/master' into NEXUS-5953-remove-eventbus-managed
Merge remote-tracking branch 'origin/master' into NEXUS-5953-remove-eventbus-managed
Merge pull request #177 from sonatype/NEXUS-5953-remove-eventbus-managed

REVIEW: [NEXUS-5953] Replace EventBus.Managed with self registration in constructor