Since meson 0.56 colons are used to filter tests by subproject, and if
we use them in test names we get:

  DEPRECATION: ":" is not allowed in test name

Cc: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Arkadiusz Hiler <arek@hiler.eu>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>