Rename Marconi to Zaqar

Due to trademark issues, Marconi can't be used as a codename for the
queuing service. A new name has been voted by the team, Zaqar.

This patch replaces Marconi with Zaqar everywhere in the infrastructure
configs. The new channel has been created and openstackinfra has been
granted with all the required permissions in that channel.

Change-Id: I8e587af588d9be0b5ebbab4b0f729b106a2ae537
Merge "Rename Marconi to Zaqar"