make timeout decorator for facts have a configurable duration (#16551)

* Add a gather_timeout parameter
* update example ansible.cfg
* fix play level fact gathering too

examples/ansible.cfg

@@ -45,6 +45,13 @@
 # A minimal set of facts is always gathered.
 #gather_subset = all
 
+# some hardware related facts are collected
+# with a maximum timeout of 10 seconds. This
+# option lets you increase or decrease that
+# timeout to something more suitable for the
+# environment. 
+# gather_timeout = 10
+
 # additional paths to search for roles in, colon separated
 #roles_path    = /etc/ansible/roles