Drop more deprecated code This follows up on changeset a8c1ea390400, in which code deprecated using logilab.common.deprecation got dropped. Now we also drop code deprecated using stdlib's warn(<msg>, DeprecationWarning). Notice that, as a consequence of dropping old/new etypes aliases in cubicweb/schema.py, we drop the import ETYPE_NAME_MAP (no longer needed); but since other modules imported that name from cubicweb.schema, we need to update the import statement to use "cubicweb" directly.

### Requirements for tests in various cubicweb/**/test directories. ###

## shared by several test folders
docutils
webtest

## cubicweb/test
Pygments
mock
#fyzz XXX pip install fails

## cubicweb/devtools/test
flake8

## cubicweb/hooks/test
psycopg2

## cubicweb/pyramid/test
pyramid >= 1.5.0
waitress >= 0.8.9
wsgicors >= 0.3
pyramid_multiauth
repoze.lru

## cubicweb/sobject/test