We need this to be stop-start as haproxy and proxysql need to be
reconfigured simultaneously when switching between them.
This change also introduces checks for service enablement.
Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>
Change-Id: I2e10f490305f3d8b1b7abbc66ddb40df65c37fe7