Gerrit: enable gerrit hooks to move bug status on all oVirt projects

I think before we do that we need to look into migrating the gerrit hooks into a gerrit plugin or at least committing the configuration to git.

cc

Lets start by collecting which projects want to be added and do the enable gradually.

new docs can be found here:
http://ovirt-gerrit-hooks.readthedocs.io/en/latest/

list of hooks per project can be found here:
http://infra-docs.readthedocs.io/en/latest/CI/Gerrit_Hooks.html#list-of-projects-and-the-hooks-they-use

Might be a good idea to ask on the devel list which project wants the status change hooks enabled and to which branches.

We can start with 'POST' and 'MODIFIED' hooks.

We can't enforce maintainers to use the hooks, not everyone wants to.
This should be an opt-in request, so any projects that wants a certain hook enabled should open a ticket with the relevant info:

• project name

• list of hooks he would like to see enabled.

Documentation on hooks available can be found here:
http://infra-docs.readthedocs.io/en/latest/CI/Gerrit_Hooks.html