napalm-linux 0.8 implements napalm-device-types' fix templates. QTS has
no apt, dnf or opkg and sets its SNMP agent in its own UI, so
configure_snmp_agent, configure_package_proxy and ensure_package are
None here: a capability check answers no instead of offering a fix
that fails, as the inherited fix_snmp and fix_apt_proxy did.
get_device_warnings returns nothing: the inherited one asked for
updates, which is None here, and logged a TypeError on every poll.
The role test follows napalm-linux's get_os_users.
Closes#6. Part of #7.
Christian Manivong