Replace app-id with approle due to deprecation (#2197)
Replace app-id with approle due to deprecation (#2197)

According to the documentation the App-ID backend is deprecated in favor of the AppRole backend since Vault 0.6.1.
rnaveiras/vault,wjam/vault,joelthompson/vault,MonsantoCo/vault,rnaveiras/vault,tallpauley/vault,hashicorp/vault,deverton/hashicorp-vault,jmhardison/vault,hartsock/vault,hartsock/vault,mgk/vault,LolalyLuo/vault,naunga/vault,michaelansel/vault,hashicorp/vault,quixoten/vault,LolalyLuo/vault,jmhardison/vault,Caiyeon/vault,joelthompson/vault,wjam/vault,jmhardison/vault,kingland/vault,hashicorp/vault,rnaveiras/vault,kingland/vault,michaelansel/vault,hashicorp/vault,jam-pot/vault,quixoten/vault,Aloomaio/vault,naunga/vault,lirao/vault,Aloomaio/vault,mymercurialsky/vault,ryon/vault,quixoten/vault,rnaveiras/vault,tallpauley/vault,hartsock/vault,hartsock/vault,jam-pot/vault,chrishoffman/vault,Aloomaio/vault,lemondrank/vault,Aloomaio/vault,lemondrank/vault,chrishoffman/vault,jmhardison/vault,Caiyeon/vault,mymercurialsky/vault,kingland/vault,Banno/vault,rnaveiras/vault,hashicorp/vault,kingland/vault,mgk/vault,mgk/vault,kingland/vault,quixoten/vault,Banno/vault,hashicorp/vault,joelthompson/vault,ryon/vault,joelthompson/vault,hartsock/vault,jmhardison/vault,mgk/vault,deverton/hashicorp-vault,lirao/vault,MonsantoCo/vault