[KARAF-3040] Upgrade to slf4j 1.7.7
[KARAF-3040] Upgrade to slf4j 1.7.7

mcculls/karaf-cellar,3cky/karaf-cellar,3cky/karaf-cellar,3cky/karaf-cellar,mcculls/karaf-cellar,FlavioF/karaf-cellar,apache/karaf-cellar,FlavioF/karaf-cellar,albertocsm/karaf-cellar,apache/karaf-cellar,FlavioF/karaf-cellar,albertocsm/karaf-cellar,albertocsm/karaf-cellar