roles/nsswitch: Configure glibc name service

The *nsswitch* role can be used to configure the name service switch on
glibc-based distributions, including Gentoo, Fedora, and CentOS. It is
specifically focused on Active Directory authentication via
Samba/Winbind.

roles/nsswitch/tasks/main.yml

@@ -0,0 +1,17 @@
+- name: load distribution-specific variables
+  include_vars: '{{ item }}'
+  with_first_found:
+  - '{{ ansible_distribution }}.yml'
+  - '{{ ansible_os_family }}.yml'
+  - defaults.yml
+
+- name: ensure nsswitch is configured
+  template:
+    src={{ item }}
+    dest=/etc/nsswitch.conf
+    mode=644
+    owner=root
+    group=root
+  with_first_found:
+  - '{{ ansible_distribution }}.nsswitch.conf.j2'
+  - default.nsswitch.conf.j2