travis: don't test STRICT_VARIABLES
travis: don't test STRICT_VARIABLES

Module actually failed this test, but due to rspec-puppet issues it looked like the tests passed.

Removing this until we actually update to pass with STRICT_VARIABLES
bastelfreak/puppet-nginx,xaque208/puppet-nginx,bulletproofnetworks/puppet-nginx,blackcobra1973/puppet-nginx,voxpupuli/puppet-nginx,bulletproofnetworks/puppet-nginx,icann-dns/puppet-nginx,hbog/puppet-nginx,raphink/puppet-nginx,jfryman/puppet-nginx,blackcobra1973/puppet-nginx,icann-dns/puppet-nginx,hbog/puppet-nginx,apa-it/puppet-nginx,ResignationMedia/puppet-nginx,ResignationMedia/puppet-nginx,apa-it/puppet-nginx,bastelfreak/puppet-nginx,jfryman/puppet-nginx,xaque208/puppet-nginx,voxpupuli/puppet-nginx