Print out status at the end of a compaction run.
Print out status at the end of a compaction run.

Summary:
Print out status at the end of a compaction run. This helps in
debugging.

Test Plan: make clean check

Reviewers: sheki

Reviewed By: sheki

Differential Revision: https://reviews.facebook.net/D7035

siddhartharay007/rocksdb,SunguckLee/RocksDB,dkorolev/rocksdb,jalexanderqed/rocksdb,facebook/rocksdb,wlqGit/rocksdb,makelivedotnet/rocksdb,wat-ze-hex/rocksdb,kaschaeffer/rocksdb,sorphi/rocksdb,caijieming-baidu/rocksdb,Vaisman/rocksdb,JackLian/rocksdb,JoeWoo/rocksdb,zhangpng/rocksdb,facebook/rocksdb,Vaisman/rocksdb,sorphi/rocksdb,Applied-Duality/rocksdb,temicai/rocksdb,vashstorm/rocksdb,kaschaeffer/rocksdb,ylong/rocksdb,caijieming-baidu/rocksdb,alihalabyah/rocksdb,flabby/rocksdb,makelivedotnet/rocksdb,ylong/rocksdb,bbiao/rocksdb,kaschaeffer/rocksdb,bbiao/rocksdb,kaschaeffer/rocksdb,amyvmiwei/rocksdb,jalexanderqed/rocksdb,lgscofield/rocksdb,Vaisman/rocksdb,RyanTech/rocksdb,SunguckLee/RocksDB,Andymic/rocksdb,hobinyoon/rocksdb,sorphi/rocksdb,tsheasha/rocksdb,vmx/rocksdb,anagav/rocksdb,wenduo/rocksdb,makelivedotnet/rocksdb,wat-ze-hex/rocksdb,anagav/rocksdb,msb-at-yahoo/rocksdb,zhangpng/rocksdb,kaschaeffer/rocksdb,tizzybec/rocksdb,tschottdorf/rocksdb,fengshao0907/rocksdb,zhangpng/rocksdb,mbarbon/rocksdb,JackLian/rocksdb,Andymic/rocksdb,tschottdorf/rocksdb,kaschaeffer/rocksdb,zhangpng/rocksdb,jalexanderqed/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,wenduo/rocksdb,tizzybec/rocksdb,Vaisman/rocksdb,alihalabyah/rocksdb,Andymic/rocksdb,JohnPJenkins/rocksdb,OverlordQ/rocksdb,vashstorm/rocksdb,ryneli/rocksdb,JoeWoo/rocksdb,OverlordQ/rocksdb,Applied-Duality/rocksdb,wenduo/rocksdb,vmx/rocksdb,fengshao0907/rocksdb,Vaisman/rocksdb,IMCG/RcoksDB,biddyweb/rocksdb,luckywhu/rocksdb,norton/rocksdb,wskplho/rocksdb,Andymic/rocksdb,geraldoandradee/rocksdb,makelivedotnet/rocksdb,skunkwerks/rocksdb,luckywhu/rocksdb,msb-at-yahoo/rocksdb,Applied-Duality/rocksdb,siddhartharay007/rocksdb,NickCis/rocksdb,geraldoandradee/rocksdb,vashstorm/rocksdb,luckywhu/rocksdb,sorphi/rocksdb,wenduo/rocksdb,virtdb/rocksdb,facebook/rocksdb,tsheasha/rocksdb,JoeWoo/rocksdb,sorphi/rocksdb,JohnPJenkins/rocksdb,NickCis/rocksdb,temicai/rocksdb,tschottdorf/rocksdb,facebook/rocksdb,mbarbon/rocksdb,caijieming-baidu/rocksdb,temicai/rocksdb,Andymic/rocksdb,wat-ze-hex/rocksdb,IMCG/RcoksDB,zhangpng/rocksdb,lgscofield/rocksdb,lgscofield/rocksdb,norton/rocksdb,sorphi/rocksdb,hobinyoon/rocksdb,biddyweb/rocksdb,NickCis/rocksdb,luckywhu/rocksdb,alihalabyah/rocksdb,alihalabyah/rocksdb,SunguckLee/RocksDB,ryneli/rocksdb,virtdb/rocksdb,RyanTech/rocksdb,amyvmiwei/rocksdb,bbiao/rocksdb,tizzybec/rocksdb,OverlordQ/rocksdb,norton/rocksdb,JackLian/rocksdb,rDSN-Projects/rocksdb.replicated,wskplho/rocksdb,ryneli/rocksdb,kaschaeffer/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb,anagav/rocksdb,wskplho/rocksdb,fengshao0907/rocksdb,mbarbon/rocksdb,caijieming-baidu/rocksdb,msb-at-yahoo/rocksdb,jalexanderqed/rocksdb,tizzybec/rocksdb,dkorolev/rocksdb,IMCG/RcoksDB,ylong/rocksdb,luckywhu/rocksdb,wlqGit/rocksdb,SunguckLee/RocksDB,biddyweb/rocksdb,tsheasha/rocksdb,ryneli/rocksdb,wenduo/rocksdb,JohnPJenkins/rocksdb,JackLian/rocksdb,IMCG/RcoksDB,amyvmiwei/rocksdb,SunguckLee/RocksDB,flabby/rocksdb,sorphi/rocksdb,tschottdorf/rocksdb,vashstorm/rocksdb,norton/rocksdb,bbiao/rocksdb,RyanTech/rocksdb,siddhartharay007/rocksdb,vashstorm/rocksdb,siddhartharay007/rocksdb,jalexanderqed/rocksdb,OverlordQ/rocksdb,wlqGit/rocksdb,lgscofield/rocksdb,flabby/rocksdb,luckywhu/rocksdb,wskplho/rocksdb,OverlordQ/rocksdb,vmx/rocksdb,geraldoandradee/rocksdb,flabby/rocksdb,vashstorm/rocksdb,wat-ze-hex/rocksdb,anagav/rocksdb,JohnPJenkins/rocksdb,skunkwerks/rocksdb,flabby/rocksdb,dkorolev/rocksdb,Applied-Duality/rocksdb,tizzybec/rocksdb,siddhartharay007/rocksdb,siddhartharay007/rocksdb,makelivedotnet/rocksdb,vashstorm/rocksdb,hobinyoon/rocksdb,wat-ze-hex/rocksdb,NickCis/rocksdb,rDSN-Projects/rocksdb.replicated,NickCis/rocksdb,norton/rocksdb,tsheasha/rocksdb,RyanTech/rocksdb,msb-at-yahoo/rocksdb,IMCG/RcoksDB,NickCis/rocksdb,ryneli/rocksdb,msb-at-yahoo/rocksdb,tschottdorf/rocksdb,mbarbon/rocksdb,rDSN-Projects/rocksdb.replicated,Vaisman/rocksdb,vmx/rocksdb,virtdb/rocksdb,zhangpng/rocksdb,hobinyoon/rocksdb,tizzybec/rocksdb,vmx/rocksdb,makelivedotnet/rocksdb,NickCis/rocksdb,fengshao0907/rocksdb,hobinyoon/rocksdb,IMCG/RcoksDB,hobinyoon/rocksdb,Andymic/rocksdb,OverlordQ/rocksdb,amyvmiwei/rocksdb,bbiao/rocksdb,dkorolev/rocksdb,tschottdorf/rocksdb,zhangpng/rocksdb,hobinyoon/rocksdb,RyanTech/rocksdb,tsheasha/rocksdb,bbiao/rocksdb,JohnPJenkins/rocksdb,makelivedotnet/rocksdb,amyvmiwei/rocksdb,alihalabyah/rocksdb,virtdb/rocksdb,wat-ze-hex/rocksdb,lgscofield/rocksdb,JackLian/rocksdb,geraldoandradee/rocksdb,JoeWoo/rocksdb,wat-ze-hex/rocksdb,JohnPJenkins/rocksdb,tsheasha/rocksdb,anagav/rocksdb,virtdb/rocksdb,JackLian/rocksdb,temicai/rocksdb,Andymic/rocksdb,lgscofield/rocksdb,fengshao0907/rocksdb,skunkwerks/rocksdb,ylong/rocksdb,RyanTech/rocksdb,luckywhu/rocksdb,fengshao0907/rocksdb,facebook/rocksdb,wskplho/rocksdb,wskplho/rocksdb,wlqGit/rocksdb,facebook/rocksdb,hobinyoon/rocksdb,amyvmiwei/rocksdb,RyanTech/rocksdb,geraldoandradee/rocksdb,fengshao0907/rocksdb,JoeWoo/rocksdb,jalexanderqed/rocksdb,temicai/rocksdb,alihalabyah/rocksdb,IMCG/RcoksDB,SunguckLee/RocksDB,wlqGit/rocksdb,rDSN-Projects/rocksdb.replicated,geraldoandradee/rocksdb,tizzybec/rocksdb,caijieming-baidu/rocksdb,wlqGit/rocksdb,dkorolev/rocksdb,bbiao/rocksdb,skunkwerks/rocksdb,vmx/rocksdb,vmx/rocksdb,amyvmiwei/rocksdb,anagav/rocksdb,rDSN-Projects/rocksdb.replicated,geraldoandradee/rocksdb,Andymic/rocksdb,JoeWoo/rocksdb,anagav/rocksdb,skunkwerks/rocksdb,skunkwerks/rocksdb,wenduo/rocksdb,Applied-Duality/rocksdb,biddyweb/rocksdb,rDSN-Projects/rocksdb.replicated,norton/rocksdb,flabby/rocksdb,ryneli/rocksdb,temicai/rocksdb,virtdb/rocksdb,tsheasha/rocksdb,norton/rocksdb,dkorolev/rocksdb,siddhartharay007/rocksdb,rDSN-Projects/rocksdb.replicated,JoeWoo/rocksdb,wlqGit/rocksdb,skunkwerks/rocksdb,ylong/rocksdb,wenduo/rocksdb,mbarbon/rocksdb,mbarbon/rocksdb,bbiao/rocksdb,caijieming-baidu/rocksdb,temicai/rocksdb,dkorolev/rocksdb,msb-at-yahoo/rocksdb,facebook/rocksdb,Vaisman/rocksdb,ryneli/rocksdb,alihalabyah/rocksdb,Applied-Duality/rocksdb,Applied-Duality/rocksdb,biddyweb/rocksdb,JackLian/rocksdb,biddyweb/rocksdb,biddyweb/rocksdb,norton/rocksdb,OverlordQ/rocksdb,jalexanderqed/rocksdb,wskplho/rocksdb,lgscofield/rocksdb,ylong/rocksdb,SunguckLee/RocksDB,JohnPJenkins/rocksdb,virtdb/rocksdb,ylong/rocksdb,flabby/rocksdb,facebook/rocksdb,mbarbon/rocksdb,tsheasha/rocksdb,caijieming-baidu/rocksdb