serialization optimizations for DAOS_OF_KV_FLAT

[dsikich]

* add daos-gen tool to generate a DAOS_OF_KV_FLAT objects
* skip akey iteration on serialize and deserialize for DAOS_OF_KV_FLAT

If an object has the DAOS_OF_KV_FLAT feature set, then there is no need to do any sort of akey iteration. The daos_kv API is used because all that is needed is oid, dkey, and the value. The obj API and the daos_kv API cannot be mixed, or it will cause errors. The KV value is stored inside of the dkey dataset.

Signed-off-by: Danielle Sikich danielle.sikich@intel.com

[dsikich]

@daltonbohning @adammoody should not be merged before #477

[adammoody]

This generally looks good to me. Of course, I can't do any runtime testing, so that limits how deeply I can review things. Just a few high-level things I saw:

• Some mixing of tabs and spaces
• Check that all if/while blocks have braces, even for single lines blocks
• There are several spots where I see char foo[size] where size is computed at runtime. I think those probably need to use a malloc(size)/free() instead in some cases.

[dsikich]

@daltonbohning @adammoody addressed the comments and broke up one of the deserialization functions

[dsikich]

@daltonbohning I've updated based on your review, thanks.

[dsikich]

@adammoody is this good to merge now?

[adammoody]

Yep, looks good to me, too. Thanks, @dsikich