Updated MAC reg ex for forward compatibility.
Updated MAC reg ex for forward compatibility.

rdobson/auto-cert-kit,xenserver/auto-cert-kit,rdobson/auto-cert-kit,bpwook/auto-cert-kit,bpwook/auto-cert-kit,vivekkumac/auto-cert-kit,vivekkumac/auto-cert-kit,xenserver/auto-cert-kit