Remove unused logger

There are a lot of files contain import logging which is used for
creating logger object. However in some files we only have definition of
logger without using him. In this patch all unused loggers and imports
are deleted.

Change-Id: Iedba6d40850cb050c5c25d9b8a6a1d7128fd4bee
Prefetch data in resource_get_by_name_and_stack

This loads resource and resource data in a single query, which means
one less sql query per stack resource in a call to describe_stack_resource.

Change-Id: Ic2e1ab68cf651f290be75206fd5c0c841de4ef82
Related-Bug: #1306743
tests remove stack_delete_after decorator

This is no longer required because cleanup is provided via reset
of the dummy db in all tests which call the base-class setUp.

Change-Id: I49cbfce0b2880d0318114df35d4abaed61d03bfc
Merge "tests remove stack_delete_after decorator"
Merge "Remove unused logger"
Merge "Prefetch data in resource_get_by_name_and_stack"