entc/gen: fix uuid fks scanning (ent#382)

Fixes ent#363

intgeration: update mysql8 version and remove test container (ent#347)

entc/gen: change name format for edge fks (ent#286)

* entc/gen: change name format for edge fks

* dialect/sql/schema: add fixture support for mysql and postgres

* sql/dialect: merge fkcolumn queries to one for the 2 dialects

Merge pull request ent#326 from facebookincubator/tmpl_list

entc/gen: adding list func to template engine