Merge pull request #492 from metabase/remove_legacy_conn_str_logic

...ntend_client/app/admin/databases/databases.controllers.js

resources/frontend_client/app/services.js

src/metabase/db.clj

src/metabase/db/migrate_details.clj

src/metabase/driver/h2.clj

src/metabase/driver/mongo/util.clj

src/metabase/driver/postgres.clj

test/metabase/api/meta/db_test.clj

test/metabase/db/migrate_details_test.clj

test/metabase/driver/generic_sql/connection_test.clj

test/metabase/driver/h2_test.clj

test/metabase/driver/mongo_test.clj

test/metabase/driver/postgres_test.clj