TT#71030 Swap prometheus and influxdb dependency alternatives

The new installations are going to be using Prometheus, and old ones
will be fine with the new influxdb alternatives. This simplifies the
installation process, as then we do not need to install the prometheus
packages and remove the influxdb packages as independent steps.

Change-Id: Id47b0713fa47a698f1d2ffc0505d0763483ff01b

debian/control

@@ -19,8 +19,8 @@ Depends:
  ${misc:Depends},
 Suggests:
  asterisk,
- influxdb-client | prometheus,
  mariadb-server,
+ prometheus | influxdb-client,
  snmp,
  sqlite3,
 Description: run system tests against NGCP systems