dracut: Disable hostonly to install more modules into initramfs

As an Linux distribution, Endless OS tries to support as much machines
as possible. So, install more modules into initramfs generated by dracut
to support more storage/block devices during the boot time by disabling
"hostonly".

If anyone needs to generate a host specific initramfs, they can pass the
"--hostonly" option to dracut.

https://phabricator.endlessm.com/T34575

Author: starnight

dracut/endless.conf

@@ -15,3 +15,8 @@ omit_drivers="nouveau"
 # Ship the bfq IO scheduler module in the initrd, as it's relied upon by
 # our udev rules that detect block devices
 add_drivers+=" bfq "
+
+# The initramfs will be distributed by ostree, so it needs to be generic. If
+# anyone needs to generate a host specific initramfs, they can pass the
+# "--hostonly" option.
+hostonly=no