[NX-19] Make "Download" a link button and move it after "Mark"

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
[NX-19] Add LoggingConfiguratorImpl UTs

LoggingConfiguratorImpl changed to be easy testing

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge remote-tracking branch 'origin/NX-19-dynamic-logging' into NX-19-dynamic-logging-overrides

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>

Conflicts:
	plugins/basic/nexus-logging-plugin/src/main/java/org/sonatype/nexus/logging/internal/LoggingConfiguratorImpl.java