[devtools] Avoid db_cache collisions and mis-loading
This is done by stopping to share the db_cache between
TestDataBaseHandler instances
It may seem overkill, but is the only way I could get it to work
properly. I think the whole db caching code needs some rework to better
work with different db handlers.
Closes #4601328
[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