Add test for get_interface_link_state
Add test for get_interface_link_state

stoned/specinfra,serverspec/specinfra,chorrell/specinfra,electrical/specinfra,r7kamura/specinfra,stefanhorning/specinfra,pfaffle/specinfra,k0kubun/specinfra,glenux/contrib-specinfra,aibou/specinfra,gh2k/specinfra,miketheman/specinfra,sean-horn/specinfra,bodgit/specinfra,ihassin/specinfra,chef-partners/specinfra-cisco,edolnx/specinfra,sergueik/specinfra,nurse/specinfra,mizzy/specinfra,lurdan/specinfra,winebarrel/specinfra,RoboticCheese/specinfra,minimum2scp/specinfra,mactkg/specinfra,chinthakagodawita/specinfra,seroron/specinfra,uroesch/specinfra,tacahilo/specinfra,hideyuki/specinfra,higanworks/specinfra,hfm/specinfra,verisign/specinfra,elibus/specinfra