This change applys the HAProxy tag to the entire play, ensuring HAProxy
configuration is generated for all services when the HAProxy tag is
specified.
Change-Id: I67f57c831a713142d38c6e7b70f814a9ee8e5aae
Closes-Bug: #1855094
(cherry picked from commit e6e6c41538cd3f508c86741afdcfd9df73958ff9)