Remove travis CI.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Switch travis status to drone.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Preserve extended attributes and acls on archlinux build

Failure to do this means that file capabilites are not preserved in the image.
Ping fails to work as a non-root user if cap_net_raw is capability is not set

Signed-off-by: Dan Griffin <dgriffin@peer1.com>
support creating cmd-less containers for arbitrary data packaging Signed-off-by: Aaron Weitekamp <aweiteka@redhat.com>