Rename serico and vigil host vars to use FQDNs

Convert fedora 30 devices to using python3 for remote ansible interpreter

hosts/inerro.tre2.local.yml

@@ -4,3 +4,5 @@ description: "Wandering excursion"
 targets:
   - admin
   - workstations
+
+ansible_python_interpreter: /usr/bin/python3

hosts/serico-nox.tre2.local.yml

@@ -0,0 +1,8 @@
+---
+description: "Smooth as Silk"
+
+targets:
+  - admin
+  - workstations
+
+ansible_python_interpreter: /usr/bin/python3

hosts/vigil-nox.tre2.local.yml

@@ -0,0 +1,8 @@
+---
+description: "Watcher who Watches the Watchmen"
+
+targets:
+  - admin
+  - workstations
+
+ansible_python_interpreter: /usr/bin/python3