[server] Make internal sessions not reset 'safe'-ness on first commit
Increment the ctx_count when disabling integrity hooks so the next
commit/rollback doesn't reset our transaction and magically turn us into
a safe session.
Closes #3168027
from cubicweb.schemas.base import in_group, CWSourceSchemaConfig
# copy __permissions__ to avoid modifying a shared dictionary
in_group.__permissions__ = in_group.__permissions__.copy()
in_group.__permissions__['read'] = ('managers',)
cw_for_source = CWSourceSchemaConfig.get_relation('cw_for_source')
cw_for_source.__permissions__ = {'read': ('managers', 'users'),
'add': ('managers',),
'delete': ('managers',)}