Butler policy files in obs packages have been changed from paf to yaml

As described in DM-7363 the paf files in the policy folder have been converted to yaml files in obs_cfht, obs_decam, obs_lsstSim, obs_sdss, obs_subaru, and obs_test,

Everything should continue to function normally. If you have local changes to paf files you’ll have to hand merge them into the yaml file.