remove the instances of the command classes

Affects: SAREF

Situation: instances of the command classes are provided in the ontology. However, if saref:SetAbsoluteLevel is "the" instance of the saref:SetAbsoluteLevelCommand class, and if one uses it to define two different commands (one with value 20 and one with value 22), then there is no way to identify which command has what value, because the same identifier is used for two commands. Also, some of these are both instances of State and command, which are conceptually distinct. Finally, they are not mentioned in the SAREF TS document

Proposal: remove these instances, and add a section in the TS where we provide very clear examples on how commands can be instantiated

Status: agreed during SmartM2M-3rd RG Meeting about 2 NWIs SAREFv3 and SAREF Com Framework V2 2019-05-09