Ansible OpenStack collection 1.x.x is not compatible to openstacksdk
>=0.99.0, only collection series 2.x.x will be. But the latter has
not been released yet.
This incompatibility only affects modules in Ansible OpenStack
Collection but not the functions that metalsmith uses. Those
functions ARE compatible with recent openstacksdk releases and
will most likely not be removed in collection release 2.0.0.
Thus, as a hacky workaround to allow using Ansible OpenStack
collection 1.x.x with openstacksdk >=0.99.0 this patch removes
the MAXIMUM_SDK_VERSION.
Change-Id: Icbcb0f92fc1e4315e81fe9ce0c2f9ce6b39867c2