do mount/umount in the chroot environment
install cron explicitly
install rasdaemon as a replacement for mcelog
switch python package docker-py to docker
ARM Architecture support in SONIC
make configure platform=[ASIC_VENDOR_ARCH] PLATFORM_ARCH=[ARM_ARCH]
SONIC_ARCH: default amd64
armhf - arm32bit
arm64 - arm64bit
Signed-off-by: Antony Rheneus <arheneus@marvell.com>