Update to go.mod

[Rajalakshmi-Girish]

After 30e86ee, below is the Error:

[root@raji-x86-workspace1 kubetest2-plugins]# make install-deployer-tf
git submodule update --init
go build -trimpath -ldflags="-buildid= -X=github.com/ppc64le-cloud/kubetest2-plugins/kubetest2-tf/deployer.GitTag=30e86ee" -o /root/kubetest2-plugins/bin/kubetest2-tf ./kubetest2-tf
go: updates to go.mod needed; to update it:
        go mod tidy
make: *** [Makefile:22: install-deployer-tf] Error 1
[root@raji-x86-workspace1 kubetest2-plugins]# 

[mkumatag]

/lgtm

[ppc64le-cloud-bot]

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This pull-request has been approved by: mkumatag, Rajalakshmi-Girish

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