fix(tiller): Adds missing import back

PR #2513 was behind master when merged. Other commits were
added that required the use of the log package. This re-adds
that package.

pkg/kube/client.go

@@ -22,6 +22,7 @@ import (
 	goerrors "errors"
 	"fmt"
 	"io"
+	"log"
 	"strings"
 	"time"