[dbapi] makes anonymous_connection a computed property
The current implementation is a boolean flag set manually by client code after
connection creation. This led to different way to decide a anonymous_connection
should be True (eg. different in the test than in the actual application code).
It should not be client responsibility to set this flag.
``cnx.anonymous_connection`` is now a purely computed property. Connection with user in the
"guests" group are anonymous, the other ain't.
``Session.anonymous_session`` is computed from ``cnx.anonymous_connection`` and get
the updated behavior transparently.
Closes #2953943
config['rql-cache-size'] = config['rql-cache-size'] * 10
add_entity_type('CWDataImport')
from cubicweb.schema import CONSTRAINTS, guess_rrqlexpr_mainvars
for rqlcstr in rql('Any X,XT,XV WHERE X is CWConstraint, X cstrtype XT, X value XV,'
'X cstrtype XT, XT name IN ("RQLUniqueConstraint","RQLConstraint","RQLVocabularyConstraint"),'
'NOT X value ~= ";%"').entities():
expression = rqlcstr.value
mainvars = guess_rrqlexpr_mainvars(expression)
yamscstr = CONSTRAINTS[rqlcstr.type](expression, mainvars)
rqlcstr.cw_set(value=yamscstr.serialize())
print 'updated', rqlcstr.type, rqlcstr.value.strip()