Restructuring/renaming DNS, DHCP, TFTP and netboot installer.

Idea: The role 'dnsmasq' and a new role 'dns-dhcp-tftp' are
drop-in replacements and interchangeable. 'netboot-installer'
works indepently of the role chosen for DNS, DHCP and TFTP.

roles/dnsmasq/tasks/main.yml

@@ -0,0 +1,22 @@
+- name: check if dnsmasq is already there
+  stat: path=/etc/dnsmasq.d/dnsmasq-dhcp
+  register: dnsmasq
+
+- name: install dnsmasq package
+  apt:
+    name:
+      - dnsmasq
+      - resolvconf
+    state: latest
+
+- name: configure dnsmasq dhcp
+  template:
+    src: dnsmasq-dhcp.j2
+    dest: /etc/dnsmasq.d/dnsmasq-dhcp
+  notify: "restart dnsmasq"
+
+- name: configure dnsmasq tftp
+  template:
+    src: dnsmasq-tftp-netboot-installer.j2
+    dest: /etc/dnsmasq.d/tftp-netboot-installer
+  notify: "restart dnsmasq"