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/dhcp-dns-dnsmasq/tasks/main.yml

@@ -1,16 +0,0 @@
-- 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
-  template:
-    src: dnsmasq-dhcp.j2
-    dest: /etc/dnsmasq.d/dnsmasq-dhcp
-  notify: "restart dnsmasq"