Added hostname setup task

tasks/setup_hostnames.yml

+---
+- name: Install some useful stuff
+  lineinfile:
+    path: /etc/hosts
+    line: |
+      10.42.0.101 vsalgo-node-1
+      10.42.0.102 vsalgo-node-2
+      10.42.0.103 vsalgo-node-3
+