basic-system: add options for resolv.conf

Allows you to configure /etc/resolv.conf in all its details.

basic-system/defaults/main.yml

@@ -16,3 +16,14 @@ tmp_mount_options:
   - nodev
   - noexec
 fstrim: false
+resolv_search:
+  - "{{ domain }}"
+resolv_nameservers: "{{ nameservers }}"
+resolv_options: []
+#   - "timeout:5"  # default, capped to 30, per resolver
+#   - "attempts:2"  # default, capped to 5
+#   - "ndots:1"  # default, capped to 15, #dots indicating absolute name
+#   - "rotate"  # try listed nameservers in round-robin instead of static order
+#   - "edns0"  # enable extensions from RFC 2671
+#   - "no-tld-query"  # disable resolving unqualified names as TLDs
+#   - "trust-ad"  # trust DNSSEC-validation of your resolver