Rename u_def to update_def and move it to def.cf.  Remove duplicate classes.
Merge pull request #176 from tzz/refactor/u_def

Rename u_def to update_def and move it to def.cf.  Remove duplicate classes
change user postgres -> cfpostgres in default policy
Merge pull request #177 from jeffali/new/cfpostgres

change user postgres -> cfpostgres in default policy
lib/3.6/files.cf: add convenience cfe_mustache bundles