* Add ip_range variable for apigee-x-instance module
* Add variable definition and validation for ip_range
* Update the validation rule for ip_range variable
We always use the same directory for terraform fixtures, so it's quite
easy to figure out its path from a pytest fixture by inspecting the
stack. This commit implements this functionality and decreases the
amount of boilerplate needed to write a test.
(Ported from fast)