NO-JIRA: [ruby] replace #sum with #reduce for ruby < 2.4
NO-JIRA: [ruby] replace #sum with #reduce for ruby < 2.4

gemmellr/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,alanconway/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,kgiusti/qpid-proton,astitcher/qpid-proton,ssorj/qpid-proton,astitcher/qpid-proton,ssorj/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,kgiusti/qpid-proton,kgiusti/qpid-proton,apache/qpid-proton,apache/qpid-proton,alanconway/qpid-proton,ChugR/qpid-proton,alanconway/qpid-proton,alanconway/qpid-proton,ssorj/qpid-proton,alanconway/qpid-proton,apache/qpid-proton,kgiusti/qpid-proton,astitcher/qpid-proton,kgiusti/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,astitcher/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,alanconway/qpid-proton,kgiusti/qpid-proton