Add BMC platform api test

Including cases:
test_get_name()
test_get_presence()
test_get_model()
test_get_serial()
test_get_revision()
test_get_status()
test_is_replaceable()
test_get_eeprom()
test_get_version()
test_reset_root_password()
test_bmc_dump()
test_bmc_firmware_update()

Change-Id: I3491eb538cc6a504200f12614fce24cafec33355

Author: echuawu

tests/common/helpers/firmware_helper.py

@@ -0,0 +1,28 @@
+import re
+
+
+def show_firmware(duthost):
+    out = duthost.command("fwutil show status")
+    num_spaces = 2
+    curr_chassis = ""
+    output_data = {"chassis": {}}
+    status_output = out['stdout']
+    separators = re.split(r'\s{2,}', status_output.splitlines()[1])  # get separators
+    output_lines = status_output.splitlines()[2:]
+
+    for line in output_lines:
+        data = []
+        start = 0
+
+        for sep in separators:
+            curr_len = len(sep)
+            data.append(line[start:start+curr_len].strip())
+            start += curr_len + num_spaces
+
+        if data[0].strip() != "":
+            curr_chassis = data[0].strip()
+            output_data["chassis"][curr_chassis] = {"component": {}}
+
+        output_data["chassis"][curr_chassis]["component"][data[2]] = data[3]
+
+    return output_data

tests/common/helpers/platform_api/bmc.py

@@ -0,0 +1,83 @@
+""" This module provides interface to interact with the BMC of the DUT via platform API remotely """
+import ast
+import json
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def bmc_pmon_api(conn, name, args=None):
+    if args is None:
+        args = []
+    conn.request('POST', '/platform/chassis/bmc/{}'.format(name), json.dumps({'args': args}))
+    resp = conn.getresponse()
+    res = json.loads(resp.read())['res']
+    logger.info('Executing chassis API: "{}", arguments: "{}", result: "{}"'.format(name, args, res))
+    return res
+
+
+def bmc_host_api(duthost, api_name, *args):
+    bmc_instance = 'sudo python -c "import sonic_platform; \
+                                    bmc = sonic_platform.platform.Platform().get_chassis().get_bmc(); \
+                                    print(bmc.{})"'
+    res = duthost.shell(bmc_instance.format(api_name + str(args)))['stdout']
+    try:
+        return ast.literal_eval(res)
+    except (ValueError, SyntaxError):
+        return res.strip()
+
+
+def get_name(conn):
+    return bmc_pmon_api(conn, 'get_name')
+
+
+def get_presence(conn):
+    return bmc_pmon_api(conn, 'get_presence')
+
+
+def get_model(duthost):
+    return bmc_host_api(duthost, 'get_model')
+
+
+def get_serial(duthost):
+    return bmc_host_api(duthost, 'get_serial')
+
+
+def get_revision(conn):
+    return bmc_pmon_api(conn, 'get_revision')
+
+
+def get_status(conn):
+    return bmc_pmon_api(conn, 'get_status')
+
+
+def is_replaceable(conn):
+    return bmc_pmon_api(conn, 'is_replaceable')
+
+
+def get_eeprom(duthost):
+    return bmc_host_api(duthost, 'get_eeprom')
+
+
+def get_version(duthost):
+    return bmc_host_api(duthost, 'get_version')
+
+
+def reset_root_password(duthost):
+    return bmc_host_api(duthost, 'reset_root_password')
+
+
+def trigger_bmc_debug_log_dump(duthost):
+    return bmc_host_api(duthost, 'trigger_bmc_debug_log_dump')
+
+
+def get_bmc_debug_log_dump(duthost, task_id, filename, path):
+    return bmc_host_api(duthost, 'get_bmc_debug_log_dump', task_id, filename, path)
+
+
+def update_firmware(duthost, fw_image):
+    return bmc_host_api(duthost, 'update_firmware', fw_image)
+
+
+def request_bmc_reset(duthost):
+    return bmc_host_api(duthost, '_request_bmc_reset')