Do not turn off host alteratord during preinstall in autoinstall mode (ALT #29783)

require installer-scripts-remount-stage2 for remount script
common-stage2)
added an Url:

notify for remount failure

employ install2-remount-functions to avoid stray processes

direct start alteratord even if it seems that systemd is here

change alerator socket dir according alterator 4.22

/run directory binding added

alterator socket dir binding removed

change alerator socket dir according alterator 4.21

use alterator-wait utility to avoid race between daemon switching

replace alteratord service instead of chroot operation

backend: alterator_api_version = 1

Fixed summary&description.
Added timestamping.

Initial build