exec/testing: exporting output attribute
exec/testing: added GetName and GetArgs methods to command struct
provision/docker/provisioner: removed route method from provisioner

Also refactoring tests to return ip information due to addition of call
to AddRoute in newContainer, which needs a call to ip, which returns an
error when docker inspect command doesn't return the correct value.
provision/docker/docker: adding route in newContainer

Also refactoring tests to return correct output to docker inspect call,
otherwise this function will returns an error and stop newContainer
execution.
provision/docker/suite_test: removed unused configuration set
provision/docker/docker: updating test to match the route added by fake router
etc/tsuru-docker.conf: removed unused routes-path conf
exec/testing/exec_test.go: fixed typo and wrong comparison of list using Equals