interface-reconfigure: use the same other-config:ethtool-* and MTU as vswitch version.
interface-reconfigure: use the same other-config:ethtool-* and MTU as vswitch version.

Replace configure_mtu() and configure_ethtool() with mtu_setting() and
ethtool_setting().

Signed-off-by: Ian Campbell <9be92b3dbbd6611e3e4c9209fb3d04b4919e7cca@citrix.com>

koushikcgit/xcp-rrdd,robhoes/squeezed,koushikcgit/xcp-rrdd,djs55/xcp-rrdd,djs55/xcp-networkd,sharady/xcp-networkd,koushikcgit/xcp-networkd,simonjbeaumont/xcp-rrdd,djs55/squeezed,koushikcgit/xcp-rrdd,djs55/xcp-rrdd,johnelse/xcp-rrdd,koushikcgit/xcp-networkd,djs55/xcp-networkd,simonjbeaumont/xcp-rrdd,johnelse/xcp-rrdd,sharady/xcp-networkd