drop mock from lower-constraints
The mock third party library was needed for mock support in py2
runtimes. Since we now only support py36 and later, we don't need it
in lower-constraints.
These changes will help us to drop `mock` from openstack/requirements
Change-Id: I9256db0f2fb0d39b67fa52e4d44ef92fbf09432d
Hervé Beraud
2 years ago