teamd_dbus: add missing methods to Introspection XML

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
man: update teamd and teamdctl manpages

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
teamd: introduce simple SR-IOV support

Just warn user if he is teaming virt functions belonging under same
physical function.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>