Update connection test for new dense.py callback in Ansible 2.3
Update connection test for new dense.py callback in Ansible 2.3

stdout_lines of whoami with -vvvv formerly included `root`
but now will include ansi code prefix: `\e[0;32mroot`.
Connection as root will always appear to have failed
unless Trellis checks for this revised string.

fullyint/trellis,pressbooks/trellis,buluma/trellis,buluma/trellis,mAAdhaTTah/bedrock-ansible,fullyint/trellis,kalenjohnson/trellis,newtonne/trellis,partounian/trellis,NicBeltramelli/trellis,cimocimocimo/cimo-wordpress-server,kalenjohnson/trellis,fullyint/trellis,Twansparant/trellis-db-sync,mAAdhaTTah/bedrock-ansible,proteusthemes/pt-ops,jeffstieler/bedrock-ansible,roots/bedrock-ansible,jeffstieler/bedrock-ansible,proteusthemes/pt-ops,buluma/trellis,fullyint/trellis,mAAdhaTTah/bedrock-ansible,partounian/trellis,cimocimocimo/cimo-wordpress-server,mAAdhaTTah/bedrock-ansible,kalenjohnson/trellis,kalenjohnson/trellis,Twansparant/trellis-db-sync,NicBeltramelli/trellis,NicBeltramelli/trellis,NicBeltramelli/trellis,partounian/trellis,Twansparant/trellis-db-sync,pressbooks/trellis,newtonne/trellis,roots/bedrock-ansible,proteusthemes/pt-ops,Twansparant/trellis-db-sync,newtonne/trellis,roots/trellis,cimocimocimo/cimo-wordpress-server,partounian/trellis,roots/trellis,cimocimocimo/cimo-wordpress-server,buluma/trellis,jeffstieler/bedrock-ansible