Add python-anyio dependency
Add python-anyio dependency

It's a new requirement for python-httpcore [1] which we are updating to
match u-c. The package exist in Fedora [2] so we can import it.

[1] https://github.com/encode/httpcore/blob/master/requirements.txt#L19
[2] https://src.fedoraproject.org/rpms/python-anyio

Change-Id: I338683a838d28c961d2a76abcef9f501be934db0

redhat-openstack/rdoinfo