snappi_tests:multidut: Tests should skip, not abort or fail if the required multidut or single dut entry is not present in variables.py

[rraghav-cisco]

Issue Description

@selldinesh ,

If the variables.py doesn't have required entry for multidut or singledut, the corresponding script/test should return skip, not fail or abort. Its better to move such checks to a common fixture rather than checking in every testcase as below:

>           pytest_assert(len(rdma_ports['tx_ports']) >= tx_port_count,
                          'MULTIDUT_PORT_INFO doesn\'t have the required Tx ports defined for \
                          testbed {}, subtype {} in variables.py'.
                          format(MULTIDUT_TESTBED, testbed_subtype))
E           Failed: MULTIDUT_PORT_INFO doesn't have the required Tx ports defined for                       testbed ixia-sonic2, subtype multi-dut-single-asic in variables.py

conn_graph_facts = {'device_bmc_info': {'rdma-m64': {}}, 'device_bmc_link': {'rdma-m64': {}}, 'device_conn': {'rdma-m64': {'Ethernet0': {...erdevice': 'ixia-sonic', 'peerport': 'Card5/Port6', 'speed': '100000'}}}, 'device_console_info': {'rdma-m64': {}}, ...}
duthosts   = [<MultiAsicSonicHost rdma-m64>]
fanout_graph_facts_multidut = {'ixia-sonic': {'device_bmc_info': {}, 'device_bmc_link': {}, 'device_conn': {'Card5/Port4': {'peerdevice': 'rdma-m64'...rd5/Port8': {'peerdevice': 'rdma-m64', 'peerport': 'Ethernet192', 'speed': '100000'}}, 'device_console_info': {}, ...}}
get_snappi_ports = [{'api_server_ip': '172.27.145.51', 'asic_type': 'cisco-8000', 'asic_value': None, 'card_id': '5', ...}, {'api_server_...id': '5', ...}, {'api_server_ip': '172.27.145.51', 'asic_type': 'cisco-8000', 'asic_value': None, 'card_id': '5', ...}]
lossless_prio_list = [3, 4]
multidut_port_info = {'multi-dut-single-asic': {'rx_ports': [], 'tx_ports': []}}
prio_dscp_map = {0: [8], 1: [0, 1, 10, 11, 12, 13, ...], 2: [5], 3: [3], ...}
rdma_ports = {'rx_ports': [], 'tx_ports': []}
request    = <FixtureRequest for <Function test_snappi[multidut_port_info1]>>
rx_port_count = 1
snappi_api = <snappi_ixnetwork.snappi_api.Api object at 0x7f2e6e971f40>
snappi_port_list = [{'api_server_ip': '172.27.145.51', 'asic_type': 'cisco-8000', 'asic_value': None, 'card_id': '5', ...}, {'api_server_...id': '5', ...}, {'api_server_ip': '172.27.145.51', 'asic_type': 'cisco-8000', 'asic_value': None, 'card_id': '5', ...}]
tbinfo     = {'auto_recover': 'False', 'comment': 'rdma-ixia automation testbed.', 'conf-name': 'ixia-sonic2', 'duts': ['rdma-m64'], ...}
testbed_subtype = 'multi-dut-single-asic'
tx_port_count = 1

snappi_tests/test_multidut_snappi.py:122: Failed

Results you see

Failing cases.

Results you expected to see

Skip if unsupported.

Is it platform specific

generic

Relevant log output

Pls see description.

Output of show version

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