Grub: add support for 'serial' and 'terminal'
Grub: add support for 'serial' and 'terminal'

Patch by Sean E. Millichamp

hercules-team/augeas-do-not-use,mlichvar/augeas,mchf/augeas,ptoscano/augeas,domcleal/augeas,pevalme/augeas,pevalme/augeas,manandbytes/augeas,mlichvar/augeas,MikaelSmith/augeas,jasperla/augeas,camptocamp/augeas,camptocamp/augeas,kunkku/augeas,mchf/augeas,hercules-team/augeas,jtopjian/augeas,camptocamp/augeas,jtopjian/augeas,dafugg/augeas,raphink/augeas,jjlin/augeas,GeoffWilliams/augeas,pevalme/augeas,jjlin/augeas,lutter/augeas,hercules-team/augeas,lutter/augeas,kumy/augeas,kunkku/augeas,kumy/augeas,bkearney/augeas,bkearney/augeas,mlichvar/augeas,ptoscano/augeas,domcleal/augeas,jasperla/augeas,camptocamp/augeas,lutter/augeas,bkearney/augeas,dafugg/augeas,kumy/augeas,domcleal/augeas,jjlin/augeas,kumy/augeas,raphink/augeas,bkearney/augeas,manandbytes/augeas,hercules-team/augeas-do-not-use,MikaelSmith/augeas,dafugg/augeas,kunkku/augeas,hercules-team/augeas-do-not-use,ptoscano/augeas,GeoffWilliams/augeas