CDPSDX-3108 fix subnet natGateway validation

[mahendra-rk]

Signed-off-by: Mahendra Korepu [email protected]

[codecov-commenter]

Codecov Report

Merging #7 (df46649) into dev (0cfe346) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev       #7   +/-   ##
=======================================
  Coverage   70.05%   70.05%           
=======================================
  Files          25       25           
  Lines        1092     1092           
=======================================
  Hits          765      765           
  Misses        327      327           

Flag	Coverage Δ
unittests	70.05% <100.00%> (ø)

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Impacted Files	Coverage Δ
cdpctl/validation/infra/validate_aws_subnets.py	90.29% <100.00%> (ø)

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[aakanser]

looks good to me, thank you for the changes!