[test] Adding platform.json configuration file test

[samaity]

- What I did
In order to allow the SONiC community to check in platform capability file i.e. platform.json
file directly under device folder. We need to add this test to make sure the contents of the this file is compliant with platform capability design specified in DPB HLD doc

- How I did it
Added platformJson_checker.py file in Test folder.

- How to verify it
With the change as-is, build passes, the built image executed on the target platform, the configuration was applied properly.

Snapshot of success Build

samaity@43b85cf2e5e7:/sonic$ BLDENV=stretch make -f slave.mk target/debs/stretch/sonic-device-data_1.0-1_all.deb
SONiC Build System
 
Build Configuration
"CONFIGURED_PLATFORM"             : "vs"
"CONFIGURED_ARCH"                 : "amd64"
"SONIC_CONFIG_PRINT_DEPENDENCIES" : ""
"SONIC_BUILD_JOBS"                : "1"
"SONIC_CONFIG_MAKE_JOBS"          : "24"
"SONIC_USE_DOCKER_BUILDKIT"       : ""
"USERNAME"                        : "admin"
"PASSWORD"                        : "admin123"
"ENABLE_DHCP_GRAPH_SERVICE"       : ""
"SHUTDOWN_BGP_ON_START"           : ""
"ENABLE_PFCWD_ON_START"           : ""
"INSTALL_DEBUG_TOOLS"             : ""
"ROUTING_STACK"                   : "frr"
"FRR_USER_UID"                    : "300"
"FRR_USER_GID"                    : "300"
"ENABLE_SYNCD_RPC"                : ""
"ENABLE_ORGANIZATION_EXTENSIONS"  : "y"
"HTTP_PROXY"                      : ""
"HTTPS_PROXY"                     : ""
"ENABLE_SYSTEM_TELEMETRY"         : "y"
"SONIC_DEBUGGING_ON"              : ""
"SONIC_PROFILING_ON"              : ""
"KERNEL_PROCURE_METHOD"           : "build"
"BUILD_TIMESTAMP"                 : ""
"BLDENV"                          : "stretch"
"VS_PREPARE_MEM"                  : "yes"
"ENABLE_SFLOW"                    : "y"
 
samaity@43b85cf2e5e7:/sonic$ ls -la target/debs/stretch/sonic-device-data_1.0-1_all.deb*
-rw-r--r-- 1 samaity gsamaity 5806088 Dec  4 01:29 target/debs/stretch/sonic-device-data_1.0-1_all.deb
-rw-r--r-- 1 samaity gsamaity   27553 Dec  4 01:29 target/debs/stretch/sonic-device-data_1.0-1_all.deb.log

 

Snapshot of target/debs/stretch/sonic-device-data_1.0-1_all.deb.log

File ../../../device/dell/x86_64-dellemc_z9264f_c3538-r0/media_settings.json passed validity check
File ../../../device/celestica/x86_64-cel_seastone-r0/platform.json passed validity check
/sonic/src/sonic-device-data/src
 

Created a few bad platform.json files to test. Build got failed for all the bad platform capability file.
Build hit following failure:

index value is missing

Error: index of Ethernet0 has no value.
File ../../../device/celestica/x86_64-cel_seastone-r0/Seastone-DX010-25-50/platform.json failed validity check
Makefile:6: recipe for target 'test' failed
make[3]: *** [test] Error 255
make[3]: Leaving directory '/sonic/src/sonic-device-data/src'

interface name is wrong in this case.

Error: Unknown Interface Esthernet8s at top level
File ../../../device/celestica/x86_64-cel_seastone-r0/Seastone-DX010-10-50/platform.json failed validity check
Makefile:6: recipe for target 'test' failed
make[3]: *** [test] Error 255
make[3]: Leaving directory '/sonic/src/sonic-device-data/src'

brakout_modes is not the correct port attribute. syntax Error

File ../../../device/dell/x86_64-dellemc_z9264f_c3538-r0/media_settings.json passed validity check
Error: brakout_modes is not the correct Port attribute.
File ../../../device/celestica/x86_64-cel_seastone-r0/Seastone-DX010-50-40/platform.json failed validity check
Makefile:6: recipe for target 'test' failed
make[3]: *** [test] Error 255

some of the port Attribute is missing

File ../../../device/celestica/x86_64-cel_seastone-r0/platform.json passed validity check
Error: index, default_brkout_mode of Ethernet16 is/are missing
File ../../../device/celestica/x86_64-cel_seastone-r0/Seastone-DX010/platform.json failed validity check
Makefile:6: recipe for target 'test' failed
make[3]: *** [test] Error 255