Add version options for kube-batch

[jiaxuanzhou]

What this PR does / why we need it:

$ make 
mkdir -p _output/bin
go build  -ldflags " \
        -X 'github.com/kubernetes-sigs/kube-batch/pkg/version.GitSHA=`git rev-parse HEAD`' \
        -X 'github.com/kubernetes-sigs/kube-batch/pkg/version.Built=`date "+%Y-%m-%d %H:%M:%S"`'   \
        -X 'github.com/kubernetes-sigs/kube-batch/pkg/version.Version=v0.2'" \
        -o _output/bin/kube-batch ./cmd/kube-batch
$  _output/bin/kube-batch --version 
API Version: v1alpha1
Version: v0.2
Git SHA: aaf29293a165477afec79b77ea4b1cad3bac030e
Built At: 2018-12-05 16:12:54
Go Version: go1.11.1
Go OS/Arch: darwin/amd64

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Release note:

NONE

[jiaxuanzhou]

/assign @k82cn

[k82cn]

/lgtm

[k82cn]

oh, make verify error; please help to fix it :)

[k82cn]

/approve

[k8s-ci-robot]

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[k82cn]

/lgtm