Make Cristian maintainer of integration-cli (he wrote it)

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Merge pull request #5864 from shykes/pr_out_make_cristian_maintainer_of_integration_cli_he_wrote_it

Make Cristian maintainer of integration-cli (he wrote it)