TRAVIS rm install step, containers have deps
TRAVIS rm install step, containers have deps

Because we migrated to using a container based system, we no longer need
to install dependencies on the travis machine itself. So, I've removed
that line, and should speed up test runs

sehqlr/mantl,KaGeN101/mantl,datascienceinc/mantl,bitium/mantl,sehqlr/mantl,KaGeN101/mantl,mantl/mantl,datascienceinc/mantl,mantl/mantl,phnmnl/mantl,CiscoCloud/mantl,CiscoCloud/microservices-infrastructure,CiscoCloud/mantl,phnmnl/mantl,bitium/mantl,CiscoCloud/microservices-infrastructure