lag MTU setting fix - fix for #18695 #4
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What I did
Fix for #18695
How I did it
When creating PortChannel, don't set MTU
MTU is set according to first port inserted to PortChannel.
When last port is removed, set PortChannel MTU back to None
How to verify it
Not tested yet
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)