sluinit: Separate out steps into their own functions
sluinit: Separate out steps into their own functions

Make functions for each step (e.g., collectors, measurements, and event
logs).

Signed-off-by: Patrick Colp <28b178ad2ea524258cc96f810e0c5ccaaabfaf13@oracle.com>

u-root/u-root,u-root/u-root,u-root/u-root