Add a way to restrict gathered facts in Ansible:

- Using gather_subset options
- By ignoring ohai/chef or facter/puppet facts

examples/ansible.cfg

@@ -31,6 +31,21 @@
 # explicit - do not gather by default, must say gather_facts: True
 #gathering = implicit
 
+# by default retrieve all facts subsets
+# all - gather all subsets
+# min - gather a very limited set of facts
+# network - gather min and network facts
+# hardware - gather hardware facts (longest facts to retrieve)
+# virtual - gather min and virtual facts
+# You can combine them using comma (ex: min,network,virtual)
+#gather_subset = all
+
+# by default run ohai
+#ignore_ohai = False
+
+# by default run facter
+#ignore_facter = False
+
 # additional paths to search for roles in, colon separated
 #roles_path    = /etc/ansible/roles