Copy sys.config into upgrade tarball
Copy sys.config into upgrade tarball

While building an upgrade the sys.config file should be copied into the
upgrade tarball so release_handler:install_releases/1 does not clobber
the existing configuration from the application environment.

surik/rebar3,fishcakez/rebar3,scatterbrain/rebar,choptastic/rebar,project-fifo/rebar3,processone/rebar3,saleyn/rebar3,matwey/rebar,blt/rebar3,oubiwann/rebar,choptastic/rebar,paulo-ferraz-oliveira/rebar,zugolosian/rebar3,shkumagai/rebar,lpgauth/rebar,macintux/rebar,basho/rebar,processone/rebar3,thomasbhatia/rebar,rebar/rebar3,blt/rebar3,norton/rebar3,choptastic/rebar,zugolosian/rebar3,K2InformaticsGmbH/rebar,surik/rebar3,beni55/rebar-1,bsmr-erlang/rebar,lrascao/rebar,evnix/rebar,heroku/rebar,fabiankrol/rebar3,fauxsoup/rebar3,scatterbrain/rebar,CMoH/rebar,shkumagai/rebar,SiDen/rebar,rebar/rebar3,erlang/rebar3,platinumthinker/rebar,SiDen/rebar,vladdu/rebar3,syl20bnr/rebar,CMoH/rebar,GabrielNicolasAvellaneda/rebar,matwey/rebar,deadok22/rebar,jbalint/rebar3,beni55/rebar,RubberCthulhu/rebar,norton/rebar,apache/couchdb-rebar,platinumthinker/rebar,walrusVision/rebar3,lpgauth/rebar,lrascao/rebar3,syl20bnr/rebar,apache/couchdb-rebar,kellymclaughlin/rebar3,paulo-ferraz-oliveira/rebar,matwey/rebar,evnix/rebar,syl20bnr/rebar,apache/couchdb-rebar,ferd/rebar3,tsloughter/rebar3,project-fifo/rebar3,cloudant/couchdb-rebar,benoitc/rebar3,sile/rebar3,jacktang/rebar,K2InformaticsGmbH/rebar,wcy123/rebar,CMoH/rebar,macintux/rebar,lpgauth/rebar,evnix/rebar,norton/rebar,wcy123/rebar,linearregression/rebar3,basho/rebar,lrascao/rebar,linearregression/rebar3,thomasbhatia/rebar,rebar/rebar,djnym/rebar3,cloudant/couchdb-rebar,oubiwann/rebar,dcarastan/rebar,platinumthinker/rebar,bsmr-erlang/rebar,lrascao/rebar,matwey/rebar,walrusVision/rebar3,GabrielNicolasAvellaneda/rebar,bsmr-erlang/rebar,shkumagai/rebar,rebar/rebar,matwey/rebar,cloudant/couchdb-rebar,heroku/rebar,bsmr-erlang/rebar,csyangchen/rebar,beni55/rebar-1,dcarastan/rebar,dcarastan/rebar,scatterbrain/rebar,csyangchen/rebar,macintux/rebar,beni55/rebar,beni55/rebar,paulo-ferraz-oliveira/rebar,fauxsoup/rebar3,lrascao/rebar,jacktang/rebar,GabrielNicolasAvellaneda/rebar,fabiankrol/rebar3,sile/rebar3,K2InformaticsGmbH/rebar,csyangchen/rebar,K2InformaticsGmbH/rebar,thomasbhatia/rebar,jbalint/rebar3,RubberCthulhu/rebar,jacktang/rebar,rebar/rebar,oubiwann/rebar,SiDen/rebar,deadok22/rebar,benoitc/rebar3,K2InformaticsGmbH/rebar,norton/rebar,lrascao/rebar,norton/rebar