* introduces peer data store to p2p/peers
* Merge refs/heads/master into p2p-extract-data-store
* Merge refs/heads/master into p2p-extract-data-store
* refactores status service
* Merge branch 'p2p-extract-data-store' of github.com:prysmaticlabs/prysm into p2p-extract-data-store
* updates tests
* gofmt
* rever decay test