test: skip speed capability test if not reported.
test: skip speed capability test if not reported.

on some interfaces ethtool is not able to report the advertised speed
capabilities. Therefore, such tests should be skipped.

Signed-off-by: Emmanuel Roullit <e51ad7dcb99c77ecf30f537962c562ac80636eba@gmail.com>

eroullit/dabba,eroullit/dabba,eroullit/dabba,eroullit/dabba