write the settings needed for calibration (FATE#315241)
fix the new ProposeAllocatedMemory

Call it only after ProposeGlobalVars, otherwise KDUMP_SETTINGS would be
empty and the file for `kdumptool calibrate` would not get written.

Besides, it was bad form to have it piggybacked on ReadAvailableMemory
factored out log_settings_censoring_passwords

using Yast::Logger
rubify: Ops.set, Builtins.foreach, Builtins.add(path, ...)

val cannot be nil because we got it from SCR.Dir
version + changes
Merge pull request #11 from yast/calibrate-with-sysconfig

actually write the sysconfig data for kdumptool calibrate (FATE#315241)