Remove "validate_services" param from featureset

This param is now set at a higher level, directly in the job definitions
using the "featureset_override" variable.

Depends-On: I8a15852c18694703c31d6a418118446832b58081
Change-Id: I3379bca8dc532e16d959e12e2fe8fbd81fb0c005

config/general_config/featureset056.yml

@@ -47,6 +47,3 @@ tempest_whitelist:
   - 'tempest.api.network.test_security_groups_negative'
   - 'tempest.api.network.test_ports'
   - 'tempest.api.network.test_routers_negative'
-
-# NOTE(cjeanner) Activate new check only on a non-voting fs
-validate_services: true