[chassis] test_show_patform_summary test fails for Sup

[anamehra]

Description

I see get_platform_summary was modified by this PR #16539 and now the AISC count is returned based on asic presence.
Earlier on Supervisor, 'show platform summary' was used to display the max asic supported, which is 16 for the cisco-8000 chassis supervisor. Now it returns the number based on the number FCs inserted.

In sonic-mgmt lab file, we are using num_asics: 16, for max asics supported, and the presence list is defined by the asic_present field.

This is causing the test case to fail.

>                     "Unexpected value of fields, actual={}, expected={} on host '{}'".format(actual_fields_values, expected_fields_values, duthost.hostname))
E       Failed: Unexpected value of fields, actual=set([u'x86_64-8800_rp_o-r0', u'FOC2149NUED', u'4', u'8800-RP-O', u'0.12', u'Cisco-8800-RP', u'chassis-packet', u'cisco-8000']), expected=set([u'Cisco-8800-RP', '16', u'cisco-8000', None]) on host 'sfd-01'

actual_fields = set(['ASIC', 'ASIC Count', 'Hardware Revision', 'HwSKU', 'Model Number', 'Platform', ...])
actual_fields_values = set(['0.12', '4', '8800-RP-O', 'Cisco-8800-RP', 'FOC2149NUED', 'chassis-packet', ...])
cmd        = 'show platform summary'
diff_fields_values = set([None, '16'])

Changing the num_asics in lab file to match the number of asic presence does not work and breaks minigraph deployment.

Steps to reproduce the issue:

Describe the results you received:

Describe the results you expected:

Output of show version:

(paste your output here)

Output of show techsupport:

(paste your output here or download and attach the file here )

Additional information you deem important (e.g. issue happens only occasionally):

[anamehra]

@abdosi , @vperumal , for your viz

[abdosi]

@anamehra working on fix on sonic-mgmt side.

[anamehra]

Fixed