gitignore: ignore build result and runtime files
gitignore: ignore build result and runtime files

mqliang/etcd,mqliang/etcd,mqliang/etcd,rnaveiras/etcd,joshix/etcd,li-ang/etcd,coreos/etcd,rnaveiras/etcd,rnaveiras/etcd,gyuho/etcd,cockroachdb/etcd,coreos/etcd,etcd-io/etcd,joshix/etcd,ajityagaty/etcd,dannysauer/etcd,mkumatag/etcd,etcd-io/etcd,mkumatag/etcd,etcd-io/etcd,dannysauer/etcd,cockroachdb/etcd,gyuho/etcd,mkumatag/etcd,li-ang/etcd,ajityagaty/etcd,ajityagaty/etcd