Installer doesn't record `resume=` parameter for resume-from-suspend

[Ikey Doherty]

We should be recording the resume=UUID=$SwapUUID to the cmdline when installing Solus, so that people can properly resume from sleep/suspend without having users edit things.

TODO:

• Write custom /etc/default/grub with the DEFAULT Cmdline edited
• Write it in the UEFI entry

Source: https://plus.google.com/u/0/+UnBarbu/posts/45GfrFLYTYL

[Ikey Doherty]

Given we now actually alter parameters for rd.luks.uuid, we should extend the behaviour
to write the resume= parameter:

30183c6