[*] Setup: Disable executing scripts (from src/script/) before setting environment

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] Kernel: Remove all modules from ROOTFS/lib/modules/* and ROOTFS_NFS/lib/modules/*, if kernel config is updated

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[-] Script: Remove obsolete script

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] Build+Setup: Add using validity timestamp for setuped environment

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>