enforce encapsulation by breaking up replication package into packages

not perfect yet, public shouldn't be required to use 'common' package to
use replication package

cmd/replication/internal/mainfsm/replicationstate_string.go

@@ -0,0 +1,35 @@
+// Code generated by "stringer -type=ReplicationState"; DO NOT EDIT.
+
+package mainfsm
+
+import "strconv"
+
+const (
+	_ReplicationState_name_0 = "PlanningPlanningError"
+	_ReplicationState_name_1 = "Working"
+	_ReplicationState_name_2 = "WorkingWait"
+	_ReplicationState_name_3 = "Completed"
+	_ReplicationState_name_4 = "ContextDone"
+)
+
+var (
+	_ReplicationState_index_0 = [...]uint8{0, 8, 21}
+)
+
+func (i ReplicationState) String() string {
+	switch {
+	case 1 <= i && i <= 2:
+		i -= 1
+		return _ReplicationState_name_0[_ReplicationState_index_0[i]:_ReplicationState_index_0[i+1]]
+	case i == 4:
+		return _ReplicationState_name_1
+	case i == 8:
+		return _ReplicationState_name_2
+	case i == 16:
+		return _ReplicationState_name_3
+	case i == 32:
+		return _ReplicationState_name_4
+	default:
+		return "ReplicationState(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+}