[201911][port2alias]: Fix to get right number of return values #1907
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What I did
master branch PR: #1906
get_port_config was modified to return different set number of arguments in PR: sonic-net/sonic-buildimage#4222. Changes in this PR is:
To address the different set of return values
To get the ports from all namespaces
How I did it
Modify port2alias to read ports from all namespaces and also add unit-test
How to verify it
Tested on single and multi-asic platforms.
Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)