Debian and Utopic+ provide xenstored through the xen package
Create a FileSR rather than FFS now we have SM enabled.
Don't assume we know how to disable xend based on distribution

Some distributions (e.g. F21) are changing how xend is run so chkconfig
might not be the right answer
Fix grub update to work for more distributions

Some dsitros, e.g. F21, do not have update-grub but expect you to call
grub2-mkconfig directly.

Default to Xen config if we can't find a better match

Fixing 'saved' grub configs (file replaced was incorrect)
Merge pull request #73 from BobBall/distro-fix

Distro fixes