Correctly detect bonded slave interface state
Correctly detect bonded slave interface state

Bonded slave interfaces under Linux were incorrectly being detected as
always up. We now check sysfs directly to determine their state.

MaicoTimmerman/i3pystatus,claria/i3pystatus,schroeji/i3pystatus,Elder-of-Ozone/i3pystatus,enkore/i3pystatus,richese/i3pystatus,drwahl/i3pystatus,Arvedui/i3pystatus,facetoe/i3pystatus,opatut/i3pystatus,richese/i3pystatus,Arvedui/i3pystatus,plumps/i3pystatus,fmarchenko/i3pystatus,eBrnd/i3pystatus,ncoop/i3pystatus,teto/i3pystatus,m45t3r/i3pystatus,opatut/i3pystatus,fmarchenko/i3pystatus,teto/i3pystatus,m45t3r/i3pystatus,schroeji/i3pystatus,ncoop/i3pystatus,claria/i3pystatus,drwahl/i3pystatus,juliushaertl/i3pystatus,enkore/i3pystatus,paulollivier/i3pystatus,Elder-of-Ozone/i3pystatus,ismaelpuerto/i3pystatus,plumps/i3pystatus,onkelpit/i3pystatus,yang-ling/i3pystatus,yang-ling/i3pystatus,asmikhailov/i3pystatus,paulollivier/i3pystatus,ismaelpuerto/i3pystatus,MaicoTimmerman/i3pystatus,asmikhailov/i3pystatus,facetoe/i3pystatus,onkelpit/i3pystatus,eBrnd/i3pystatus,juliushaertl/i3pystatus