Signed-off-by: maipbui <maibui@microsoft.com>
#### Why I did it
`os` - not secure against maliciously constructed input and dangerous if used to evaluate dynamic content.
#### How I did it
`os` - use with `subprocess`
#### How to verify it
These patches add support for the Broadcom XMC card (XLR/GTS). At this moment
only Tomahawk switch (BCM956960K) is supported. Add
device/broadcom/x86_64-bcm_xlr-r0 and
platform/broadcom/sonic-platform-modules-brcm-xlr-gts files