Update e2e-node-tests.md to include KUBE_ROOT

[ngopalak-redhat]

KUBE_ROOT environment variable is used while building node e2e tests. Failing to set this variable will result in the error:

I0327 08:36:58.617691    1793 build.go:59] Building k8s binaries...
make: Entering directory '/home/ubuntu/go/k8s.io/kubernetes'
make: *** No targets specified and no makefile found.  Stop.
make: Leaving directory '/home/ubuntu/go/k8s.io/kubernetes'
F0327 08:36:58.627303    1793 run_local.go:51] Failed to build the dependencies: unable to build cgo targets : failed to build go packages exit status 2
exit status 255

while running make test-e2e-node using the local or the remote method. The environment variable KUBE_ROOT is used here

Which issue(s) this PR fixes:

Fixes #

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: ngopalak-redhat / name: Neeraj Krishna Gopalakrishna (e27f367460e3ce46a974f0f00e242c1f250c1814)

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[palnabarun]

/ok-to-test

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/sig testing /remove-lifecycle stale

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The Kubernetes project currently lacks enough contributors to adequately respond to all PRs.

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/lifecycle stale

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/lifecycle rotten