fix: use exec.LookPath function

[guilhem]

This function us standard PATH environment variable

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Use standard function exec.LookPath instead of custom wrote.

Special notes for your reviewer:

Is it a wanted behavior to have path hard-coded? And why

Does this PR introduce a user-facing change?:

no

Use exec.LookPath function

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[pohly]

This function us standard PATH environment variable

Have you verified that PATH is set when the driver is invoked inside the containers defined in the YAML files?

/ok-to-test

[guilhem]

This function us standard PATH environment variable

Have you verified that PATH is set when the driver is invoked inside the containers defined in the YAML files?

$ make container
$ docker run --rm --entrypoint "/bin/sh"  docker.io/library/hostpathplugin:latest -c "env" 
HOSTNAME=5b84dd50d494
SHLVL=1
HOME=/root
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/

[pohly]

/lgtm

[pohly]

/assign @jsafrane

for approval

[pohly]

@guilhem please rebase

[guilhem]

@pohly rebased + add signoff in commit message + wrap command error.

[pohly]

/approve

[pohly]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guilhem, pohly

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