WIP: Ensure that /boot partition is not required

[KKoukiou]

In the general case, if we have a single operating system, there's no need to create the /boot partition as long as our hardware is recent. New machines don't have the old restrictions that required the creation of the /boot partition.

This new attribute will be used in the front-end to guide the users who are doing manual mount point assignment.

Relevant to: rhbz#2234640

[KKoukiou]

@vojtechtrefny I am trying to approach the request on making /boot recommened - not required when not needed. I will need some guidance on this, I am not much familiar with this and also I am not sure how to find which platforms actually require the /boot seperate.

I just found the method; def _execute_reqpart(self, storage, data): in the custom partitioning, which does the logic I am trying to reinvent. I guess I need someone with better knowledge of the backend than me here.

[vojtechtrefny]

also I am not sure how to find which platforms actually require the /boot seperate.

Requirement for the separate /boot is not based on platform, but on storage on which / is located. Separate /boot is needed if / is on a device which is encrypted or on LVM*. There are also limits for MD RAID levels and metadata versions and some special cases for network storage (separate /boot on a local disk is needed for non-iBFT iSCSI).

*) These limits are partially self-imposed, GRUB2 does support booting from an encrypted device or LVM volume, but there are some problems with that and we don't want to support it.