Remove teamcity_server var from playbooks

This variable is already defined in the inventory and the way it is right now
prevents us from testing in a local teamcity instance since the value of the
variable available in the playbook will supercede the one we define in a custom
inventory.

Also removing some extra empty newlines at the end of files that are not needed.

Testing Done:
Replaced the call to the roles by a simple `fail` call with a msg that prints the variable value and the printed value was the one it got from the inventory.
Can't really test more than that since I don't have access to the imfreedom teamcity instance but I have no reason to believe that this would break things since the variable is defined for all hosts in `inventory/pidgin/hosts.yaml`.

Reviewed at https://reviews.imfreedom.org/r/1141/