The timeout for gathering facts needs to be settable from three places
(highest precedence to lowest):
* programmatically
* ansible.cfg (equivalent to the user specifying it explicitly when
calling setup)
* from the default value
The code was changed in b4bd6c80de to
allow programmatically and the default value to work correctly but
setting via ansible.cfg/parameter was broken.
This change should fix setting via ansible.cfg and adds unittests for
all three cases
Fixes#23753
