remove obsolete _platform_attributes and _get_platform_attributes in base platform driver class
remove logic and definitions related with IDs for platform attributes being composed of name and instance number (with pipe as separator).
remove unused writable property from AttrNode
add -d and -e options to oms_simulator_server to override default platform definition file and simulated events file
adjustments in and documentation for get_attributes in platform driver (and rsn subclass)
Merge pull request #2189 from carueda/pa_pd_cioms_alignment

Platform driver CI-OMS alignment and cleanup