Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Make log level debug for "Ignoring limits"
  Use isEmpty instead of size
  Use Logger's built-in String formatting

Adjust AccountLimitsFinder to make log level debug for "Ignoring
limits".

Change-Id: I91b4c03d19ee473433bdbd6d28adaa937dc89008