[test/querier] use the new connection api (part 1/3)
In devtools/repotest, we provide a simple `.qexecute` with autocommit,
and we use it (where possible) in unittest_querier.
Note that the .session object is a real session, not the magic property
found in CubicWebTC test classes.
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
attr-rgx = (w|[a-z_][a-z0-9_]{2,30})
variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$
argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception