[201911] DellEMC S6100 SSD Monitor

[santhosh-kt]

Why I did it

• To monitor the SSD health condition in DellEMC S6100 platform post upgrade.

• A daemon is introduced to monitor the SSD every one hour.

• To check for SSD status at boot time and at the time of cold-reboot.

• All these changes are supported only for newer SSD firmware.

• Added a platform_reboot_pre_check script to prevent cold-reboot based on SSD status.
  Depends on Azure/sonic-utilities#1472
  DO NOT MERGE UNTIL ABOVE PR IS MERGED

How I did it

On branch s6100_gpio_201911
Changes to be committed:
(use "git reset HEAD ..." to unstage)

    modified:   platform/broadcom/sonic-platform-modules-dell/debian/platform-modules-s6100.install
    new file:   platform/broadcom/sonic-platform-modules-dell/s6100/scripts/iSMART_64
    new file:   platform/broadcom/sonic-platform-modules-dell/s6100/scripts/platform_reboot_pre_check
    modified:   platform/broadcom/sonic-platform-modules-dell/s6100/scripts/s6100_platform.sh
    new file:   platform/broadcom/sonic-platform-modules-dell/s6100/scripts/s6100_ssd_mon.sh
    new file:   platform/broadcom/sonic-platform-modules-dell/s6100/systemd/s6100-ssd-monitor.service
    new file:   platform/broadcom/sonic-platform-modules-dell/s6100/systemd/s6100-ssd-monitor.timer

How to verify it

Attached logs for reference.
Logs.zip

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012

Description for the changelog

A picture of a cute animal (not mandatory but encouraged)

[santhosh-kt]

@jleveque : Please dont commit this PR(No issues with sonic-utilities PR).
One more change is on the way additional to this change.