Add cutomized dashboard to PM.

Merged Andrey Vertiprahov requested to merge patch-custom-pm-dash into master

Add cutomized dashboard to PM. Allows jinja templates to <noc_custom>/templates/pm, and own dashboards to <noc_custom>/services/web/apps/pm/ddash/dashboards/<own_dash>.py.

Edited by Andrey Vertiprahov

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