Executing kubetest2 error in local e2e

[Yisaer]

Bug Report

error msg:

info: downloading kubetest2-eks v0.0.6
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   607  100   607    0     0    594      0  0:00:01  0:00:01 --:--:--   595
100 2589k  100 2589k    0     0   362k      0  0:00:07  0:00:07 --:--:--  533k
info: run 'kubetest2 kind --up --test exec --image-name kindest/node:v1.12.10@sha256:68a6581f64b54994b824708286fafc37f1227b7b54cbb8865182ce1e036ed1cc --up-retries 3 --cluster-name tidb-operator --config /var/folders/fr/t8qp6yps6dj9dl6xpnfh4l5w0000gn/T/tmp.mZfkhOxH --verbosity 4 -- hack/run-e2e.sh --ginkgo.focus=\[Feature: AdvancedStatefulSet\]\[Feature: Webhook\]'
./hack/e2e.sh: line 515: /Users/yisa/Downloads/Github/GoProject/src/github.com/pingcap/tidb-operator/output/bin/kubetest2: cannot execute binary file: Exec format error

Here is the info for the downloaded bin

# yisa @ yisa-MBP in ~/Downloads/Github/GoProject/src/github.com/pingcap/tidb-operator/output/bin on git:add_label_for_auto_scale_out_tikv x [23:59:00] 
$ ls -ll
total 242552
-rwxr-xr-x  1 yisa  staff  34396224 May 15  2018 helm
-rwx--x--x  1 yisa  staff   9241936 Feb 27 21:30 kind
-rwx--x--x  1 yisa  staff  56860112 Feb 27 21:33 kubectl
-rwx--x--x  1 yisa  staff   5103943 Feb 27 23:54 kubetest2
-rwx--x--x  1 yisa  staff   5262026 Feb 27 23:57 kubetest2-eks
-rwx--x--x  1 yisa  staff   6296503 Feb 27 23:57 kubetest2-gke
-rwx--x--x  1 yisa  staff   5266056 Feb 27 23:57 kubetest2-kind

cc @cofyc

[cofyc]

my mistake, I should have built a binary for darwin too, will fix it soon.