[sai-gen] Move default value from template to SAI generation script. #495
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Currently, the default value of each SAI attribute is specified in saiapi.h.j2 template, using if-else. This can be simplified by directly using the default value from the type info in SAI generation script.
This change also makes adding more SAI types easier in the future, for both existing types or new types (just like new enums today, we only need to register it to type registry, then everything else will be taken care of).