[GCE]: SDK node doesn't recognize "kubectl"

[AJNOURI]

Each time I install a new SDK node, it doesn't recognize the path "/usr/lib/google-cloud-sdk/bin" to (kubectl, ...)
I have to add it manually to PATH.

It even asks me after component update (gcloud components update), to remove the "old" path "/usr/lib/google-cloud-sdk/bin":

# gcloud container clusters create ...

Creating cluster cluster1...done.
Created [https://container.googleapis.com/v1/projects/gns3-data/zones/us-east1-d/clusters/cluster1].
kubeconfig entry generated for cluster1.
NAME ZONE MASTER_VERSION MASTER_IP MACHINE_TYPE NODE_VERSION NUM_NODES STATUS
cluster1 us-east1-d 1.6.7 X.X.X.X n1-standard-1 1.6.7 1 RUNNING

Updates are available for some Cloud SDK components. To install them,
please run:
$ gcloud components update

Run gcloud update:

# gcloud components update

...
Update done!
...
Updates are available for some Cloud SDK components. To install them,
please run:

...
WARNING: There are older versions of Google Cloud Platform tools on your system PATH.
Please remove the following to avoid accidentally invoking these old tools:

/usr/lib/google-cloud-sdk/bin/dev_appserver.py
/usr/lib/google-cloud-sdk/bin/docker-credential-gcloud
/usr/lib/google-cloud-sdk/bin/git-credential-gcloud.sh
/usr/lib/google-cloud-sdk/bin/bq
/usr/lib/google-cloud-sdk/bin/gcloud
/usr/lib/google-cloud-sdk/bin/gsutil
/usr/lib/google-cloud-sdk/bin/endpointscfg.py

Knowing that, after update these commands are nowhere but in "/usr/lib/google-cloud-sdk/bin/kubectl"

find / -name 'kubectl'

/usr/lib/google-cloud-sdk/bin/kubectl

Is there something wrong with the install/update mechanism that doesn't recognize the location of these tools?

---

# lsb_release -a

Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty

# gcloud --version

Google Cloud SDK 167.0.0
beta 2017.03.24
bq 2.0.25
core 2017.08.11
gcloud
gsutil 4.27

[AJNOURI]

suplicate of #3