[uni06zeta][neutron] remove log_dir

[eduolivares]

The parameter log_dir was wrongly configured and, due to this, no neutron logs were written in uni06zeta jobs.

[openshift-ci]

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[softwarefactory-project-zuul]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.

[eduolivares]

recheck

[softwarefactory-project-zuul]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.

[eduolivares]

recheck

[karelyatin]

/lgtm
Also seeing some other irrelvant config which should also be cleaned up. like seeing some l3 agent/dvr specfic which not relevant with ml2/ovn.