[KARAF-2334] Upgrade to slf4j 1.7.5
[KARAF-2334] Upgrade to slf4j 1.7.5

git-svn-id: 71d8a689455c5fbb0f077bc40adcfc391e14cb9d@1487241 13f79535-47bb-0310-9956-ffa450edef68

grgrzybek/karaf,grgrzybek/karaf,grgrzybek/karaf