WIP rewrite the daemon

cmd subdir does not build on purpose, it's only left in tree to grab old
code and move it to github.com/zrepl/zrepl/daemon

daemon/connecter/connect_tcp.go

@@ -0,0 +1,24 @@
+package connecter
+
+import (
+	"context"
+	"github.com/zrepl/zrepl/config"
+	"net"
+)
+
+type TCPConnecter struct {
+	Address string
+	dialer  net.Dialer
+}
+
+func TCPConnecterFromConfig(in *config.TCPConnect) (*TCPConnecter, error) {
+	dialer := net.Dialer{
+		Timeout: in.DialTimeout,
+	}
+
+	return &TCPConnecter{in.Address, dialer}, nil
+}
+
+func (c *TCPConnecter) Connect(dialCtx context.Context) (conn net.Conn, err error) {
+	return c.dialer.DialContext(dialCtx, "tcp", c.Address)
+}