adds raft consensus. Multinode test needs fixing

Author: jonny7

api/v1/log.pb.go

@@ -7,6 +7,8 @@ option go_package = "gitlab.com/jonny7/distrolog/api/log_v1";
 message Record {
   bytes value = 1;
   uint64 offset = 2;
+  uint64 term = 3;
+  uint32 type = 4;
 }
 
 service Log {

api/v1/log.proto

@@ -6,6 +6,8 @@ require (
 	github.com/casbin/casbin v1.9.1
 	github.com/gorilla/mux v1.8.0
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
+	github.com/hashicorp/raft v1.1.1
+	github.com/hashicorp/raft-boltdb v0.0.0-20171010151810-6e5ba93211ea
 	github.com/hashicorp/serf v0.8.5
 	github.com/stretchr/testify v1.7.0
 	github.com/travisjeffery/go-dynaport v1.0.0
@@ -19,21 +21,23 @@ require (
 
 require (
 	github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible // indirect
-	github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da // indirect
+	github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c // indirect
 	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-hclog v0.9.1 // indirect
 	github.com/hashicorp/go-immutable-radix v1.0.0 // indirect
-	github.com/hashicorp/go-msgpack v0.5.3 // indirect
+	github.com/hashicorp/go-msgpack v0.5.5 // indirect
 	github.com/hashicorp/go-multierror v1.0.0 // indirect
 	github.com/hashicorp/go-sockaddr v1.0.0 // indirect
 	github.com/hashicorp/golang-lru v0.5.0 // indirect
 	github.com/hashicorp/memberlist v0.1.3 // indirect
 	github.com/miekg/dns v1.0.14 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529 // indirect
+	go.etcd.io/bbolt v1.3.5 // indirect
 	go.uber.org/atomic v1.4.0 // indirect
 	go.uber.org/multierr v1.1.0 // indirect
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 // indirect
@@ -42,3 +46,5 @@ require (
 	golang.org/x/text v0.3.5 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
+
+replace github.com/hashicorp/raft-boltdb => github.com/travisjeffery/raft-boltdb v1.0.0