[Thinkit] Use a new test fixture for sflow reboot test. Collect ASIC_DB and CONFIG_DB in sFlow debug logs.Add an API to set sflow interface config. Verify the packets received at SUT when sending traffic from control switch. Change backoff test traffic speed to generate 850 samples/sec

[VSuryaprasad-HCL]

Key_word Check:

~/pins_upstream/sonic-buildimage/src/sonic-p4rt/sonic-pins/tests/sflow$ ~/tools/keyword_checks.sh .
Keyword check Passed.

Build result:

/sonic/src/sonic-p4rt/sonic-pins$ bazel build $BAZEL_BUILD_OPTS ...
INFO: Analyzed 638 targets (0 packages loaded, 0 targets configured).
INFO: Found 638 targets...
INFO: Elapsed time: 0.533s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action

Test result:

/sonic/src/sonic-p4rt/sonic-pins$ bazel test $BAZEL_BUILD_OPTS --cache_test_results=no ...
INFO: Analyzed 638 targets (0 packages loaded, 0 targets configured).
INFO: Found 426 targets and 212 test targets...
INFO: Elapsed time: 161.150s, Critical Path: 115.30s
INFO: 266 processes: 321 linux-sandbox, 18 local.
INFO: Build completed successfully, 266 total actions
//dvaas:port_id_map_test                                                 PASSED in 1.5s
//dvaas:test_run_validation_golden_test                                  PASSED in 0.1s
//dvaas:test_run_validation_test                                         PASSED in 1.0s
//dvaas:test_run_validation_test_runner                                  PASSED in 0.1s
//dvaas:test_vector_stats_diff_test                                      PASSED in 0.1s
//dvaas:test_vector_stats_test                                           PASSED in 0.1s
//thinkit:mock_control_device_test                                       PASSED in 1.0s
//thinkit:mock_generic_testbed_test                                      PASSED in 1.4s
//thinkit:mock_mirror_testbed_test                                       PASSED in 1.2s
//thinkit:mock_ssh_client_test                                           PASSED in 0.2s
//thinkit:mock_switch_test                                               PASSED in 1.6s
//thinkit:mock_test_environment_test                                     PASSED in 0.1s
//thinkit:switch_test                                                    PASSED in 1.3s
//sai_p4/instantiations/google/tests:p4_constraints_integration_test     PASSED in 1.6s
  Stats over 5 runs: max = 1.6s, min = 1.1s, avg = 1.3s, dev = 0.2s
//sai_p4/instantiations/google/test_tools:table_entry_generator_test     PASSED in 43.6s
  Stats over 50 runs: max = 43.6s, min = 0.9s, avg = 3.3s, dev = 8.2s

Executed 212 out of 212 tests: 212 tests pass.
INFO: Build completed successfully, 266 total actions

[mssonicbld]

/azp run

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[jaanah-hcl]

@kishanps Kindly review the PR
Thanks

[mssonicbld]

/azp run

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[mssonicbld]

/azp run

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[mssonicbld]

/azp run

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