change array to hash in linux network plugin arp (ohai-31)
change array to hash in linux network plugin arp (ohai-31)

Signed-off-by: Opscode, Inc. <6e153e0b007d41886131fe1b3c497d3f384be07d@opscode.com>
375gnu/ohai,mattray/ohai,Fodoj/ohai,tas50/ohai-1,numericillustration/ohai,btm/ohai,n-marton/ohai,juliandunn/ohai,glennmatthews/ohai,ktheory/ohai,phreakocious/ohai,johnbellone/ohai,jaymzh/ohai,higanworks/ohai,mattray/ohai,nathwill/ohai,adamleff/ohai,MSOpenTech/ohai,tas50/ohai-1,joyent/ohai,375gnu/ohai,davide125/ohai,glennmatthews/ohai,chef/ohai,jbfavre/ohai,Fodoj/ohai,davide125/ohai,broadinstitute/ohai,jaymzh/ohai,MSOpenTech/ohai,jseely/ohai,dreamnite/ohai,shtzr840329/ohai,n-marton/ohai,chef/ohai,higanworks/ohai,johnbellone/ohai,bougyman/ohai,juliandunn/ohai,Juniper/ohai,acaiafa/ohai,jseely/ohai,dreamnite/ohai,jbfavre/ohai,shtzr840329/ohai,nathwill/ohai,criteo-forks/ohai,sh9189/ohai,cmluciano/ohai,zuazo-forks/ohai,btm/ohai,http-418/ohai,sh9189/ohai,broadinstitute/ohai,adamleff/ohai,cmluciano/ohai,bougyman/ohai,acaiafa/ohai,phreakocious/ohai,http-418/ohai,thommay/ohai,numericillustration/ohai,criteo-forks/ohai,zshuo/ohai,zshuo/ohai,Juniper/ohai