* Reduce SONiC migration partition from 8G to 1G.
* Changes to create 1G partition with ability to resize post migration.
* Remove redundant changes in varlog
* Use findfs to interpret root. Move resize in case cmdline params are reordered
This commit will convert the existing file system of flash drive on Arista switches from VFAT to EXT4 in the booting of SONiC. It will take the whole flash and therefore remove the recovery partition. There is a check in the script making sure that the conversion operation will not happen on a non-Arista switch or if the existing file system is not VFAT.
