Drop default.yaml file

#375 splits the default vars into different scenario files.
openstack-k8s-operators/ci-framework#2267
suggests to use Use cifmw_architecture_scenario to set proper automation
file.

So we are no longer needing default.yaml file.

Depends-On: openstack-k8s-operators/ci-framework#2267

Signed-off-by: Chandan Kumar (raukadah) <raukadah@gmail.com>

zuul.d/projects.yaml

@@ -5,17 +5,12 @@
       - rhoso-architecture-validate-bgp
       - rhoso-architecture-validate-bgp_dt01
       - rhoso-architecture-validate-hci
-      - rhoso-architecture-validate-hci
-      - rhoso-architecture-validate-nfv-ovs-dpdk-sriov-hci
       - rhoso-architecture-validate-nfv-ovs-dpdk-sriov-hci
       - rhoso-architecture-validate-osasinfra
       - rhoso-architecture-validate-ovs-dpdk
-      - rhoso-architecture-validate-ovs-dpdk
-      - rhoso-architecture-validate-ovs-dpdk-sriov
       - rhoso-architecture-validate-ovs-dpdk-sriov
       - rhoso-architecture-validate-pidone
       - rhoso-architecture-validate-sriov
-      - rhoso-architecture-validate-sriov
       - rhoso-architecture-validate-uni01alpha
       - rhoso-architecture-validate-uni02beta
       - rhoso-architecture-validate-uni04delta