Add SSD Health CLI utility

[andriymoroz-mlnx]

Signed-off-by: Andriy Moroz c_andriym@mellanox.com

- What I did
Added CLI for SSH Health API

- How I did it
utility + "show platform ssdhealth"

- How to verify it

- Previous command output (if the output of a command-line utility has changed)

- New command output (if the output of a command-line utility has changed)
Output examples for different SSD models:

root@arc-switch1038:/home/admin# show platform ssdhealth
Device Model : StorFly VSFBM4XC030G-MLX
Health       : 99.635%
Temperature  : 47C

root@arc-switch1038:/home/admin# show platform ssdhealth --verbose
Command: ssdutil -d /dev/sda -v
Device Model : StorFly VSFBM4XC030G-MLX
Firmware     : 0728-000
Serial       : P1T14004420709110047
Health       : 99.635%
Temperature  : 47C
root@arc-switch1038:/home/admin#

root@mts-sonic-dut:/home/admin# show platform ssdhealth
Device Model : InnoDisk Corp. - mSATA 3ME
Health       : 30.067%
Temperature  : 0C

root@mts-sonic-dut:/home/admin# show platform ssdhealth --verbose
Command: ssdutil -d /dev/sda -v
Device Model : InnoDisk Corp. - mSATA 3ME
Firmware     : S140714
Serial       : 20160404AA140000004B
Health       : 30.067%
Temperature  : 0C

-->

[liat-grozovik]

retest please

[andriymoroz-mlnx]

Last update skips health and temperature units if value is N/A
e.g.

Before:
root@arc-switch1038:/home/admin# show platform ssdhealth
Device Model : StorFly VSFBM4XC030G-MLX
Health       : 99.575%
Temperature  : 47C

root@arc-switch1038:/home/admin# show platform ssdhealth /dev/sdb
Device Model : N/A
Health       : N/A%
Temperature  : N/AC

After:
root@arc-switch1038:/home/admin# show platform ssdhealth
Device Model : StorFly VSFBM4XC030G-MLX
Health       : 99.575%
Temperature  : 43C

root@arc-switch1038:/home/admin# show platform ssdhealth /dev/sdb
Device Model : N/A
Health       : N/A
Temperature  : N/A