The value of tmnxMcLagConfigLaglacpKey specifies a 16bit key that
needs to be configured in the same manner on both sides of the mc-lag
in order for the mc-lag to come up.
The value of tmnxMcLagConfigLaglacpKey must be 0 when the value of
tLagStandbySignaling of the corresponding LAG is 'powerOff (2)'.
The value of tmnxMcLagConfigLaglacpKey cannot be 0 when the value of
tLagStandbySignaling of the corresponding LAG is 'lacp (1)'.