logging: Use mozilla_logger

Mozilla logger will truncate messages larger than 60k instead of
dropping them.
remove shared-secret-in-url
remove the `in-app-sandbox` waffle
remove api-tokens switch
Merge pull request #1686 from clouserw/create-api-tokens

remove api-tokens switch
Merge pull request #1685 from clouserw/shared-secret-in-url

remove shared-secret-in-url
Merge pull request #1684 from mstriemer/remove-in-app-sandbox-waffle

remove the `in-app-sandbox` waffle
Merge pull request #1683 from oremj/use_mozilla_logger

logging: Use mozilla_logger
Removed in-app-payments waffle
fix waffle numbers
remove bad test.  r=mat
remove `collections-use-es-for-apps` waffle switch
use_master to prevent recursion due to outdated app instance (bug 964311)
Fix reindexing upsold app when upsell changes (bug 956820)