Improved backward compatibility
Improved backward compatibility

New host check routine used XS 6.1+ feature. Changed it to support XS 6.0.

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