tmnxDot1agCfmMepSlmTWTestEntry contains the configuration for
generating Synthetic Loss Measurement (SLM) Tests for a particular MEP.
A row exists for each row in the dot1agCfmMepTable, and is destroyed
automatically with the removal of a row in the dot1agCfmMepTable.
Results from a two-way SLM test are reported in
tmnxDot1agCfmMepSlmTestRsltTable with the tmnxDot1agCfmMepSlmTestType
set to 'twoWayTest (2)'.