Fix to bug in handlers with ansible_lsb.codename

[santiagomr]

Hi, thanks for share. With Ansible 2.8.4 on a Debian Stretch server, I get the following error when the handlers are going to run:

FAILED! => {"msg": "The conditional check 'ansible_lsb.codename == \"trusty\"' failed. 
The error was: error while evaluating conditional (ansible_lsb.codename == \"trusty\"): 
'dict object' has no attribute 'codename'

One fix for this problem is that what I propose in this PR: replace ansible_lsb.codename with ansible_distribution_release.