[#4914] add graceful stop & restart signal handling
[#4914] add graceful stop & restart signal handling

apache/allura,apache/incubator-allura,lym/allura-git,apache/allura,apache/incubator-allura,lym/allura-git,lym/allura-git,Bitergia/allura,apache/allura,lym/allura-git,lym/allura-git,apache/allura,Bitergia/allura,Bitergia/allura,heiths/allura,heiths/allura,heiths/allura,heiths/allura,Bitergia/allura,heiths/allura,apache/incubator-allura,apache/allura,apache/incubator-allura,Bitergia/allura