Grammar fix: will -> can
Grammar fix: will -> can

This fixes a nit from:

  https://review.openstack.org/#/c/335673/2/keystone/conf/identity.py@24

Change-Id: I5a69a7bbcf885fc5d35ff1fe0d1f1da37a201a21

ilay09/keystone,mahak/keystone,openstack/keystone,cernops/keystone,rajalokan/keystone,cernops/keystone,openstack/keystone,mahak/keystone,rajalokan/keystone,ilay09/keystone,ilay09/keystone,openstack/keystone,mahak/keystone,rajalokan/keystone