[server] extract "no pooler" CnxSet class to a _BaseCnxSet class
So we get rid of "if self._queue is None" in each method of _CnxSetPool
Also add helper get_cnxset(source, size) to instantiate the correct pooler class.
Tests: unittest
Depends:
python3-cubicweb, cubicweb-ctl,
@builddeps@,
python3-pytest,
python3-flake8,
python3-psycopg2, postgresql, postgresql-plpython,
python3-ldap3, slapd, ldap-utils
Restrictions: allow-stderr, isolation-container
Tests: skeleton-packaging
Depends:
python3-cubicweb, cubicweb-ctl,
python3-pyramid, python3-wsgicors,
devscripts, equivs, lintian, autopkgtest
Restrictions: allow-stderr, needs-root