add basic setup topo

dev_env_data/clab/basic_setup.yaml

+name: gosdn_csbi_arista_base
+
+mgmt:
+  network: gosdn-csbi-arista-base-net
+  ipv4_subnet: 172.100.0.0/16
+  ipv6_subnet: 2001:db8::/64
+
+topology:
+  kinds:
+    ceos:
+      image: registry.code.fbi.h-da.de/danet/containers/ceos:4.28.2F
+  nodes:
+    ceos0:
+      kind: ceos
+      mgmt_ipv4: 172.100.0.11
+
+    ceos1:
+      kind: ceos
+      mgmt_ipv4: 172.100.0.12
+
+  links:
+    - endpoints: ["ceos0:eth1","ceos1:eth1"]