Avoid use after free since only xsize(), xmalloc(), and xfree() check the
magic bits.

Add DATA_PARSER_HOSTLIST_STRING to handle hostlist as strings in struct.
Add HOSTLIST parsing function for DATA_PARSER_HOSTLIST_STRING.

Remove need for NODE_STATES_NO_VAL

There are two types of NULL terminated arrays. First is an array of
pointers to the actual parser objects. The second is a single chunk of
memory holding each object sequentially in an array.

Correct description of JOB_ARRAY_RESPONSE_MSG by specifying resultant
OpenAPI array.

OpenAPI clients can't handle the results field being null.

Workaround for OpenAPI clients.

Source was being parsed using a float instead as an integer.