GitLab

- also remove deprecated *set_conf* functions

- shift to init_info struct similar to margo and abt-io
- add field for (currently unused) json

- in preparation for using json-c and/or bedrock instead

- eventually need to handle conditional compilation of bake back ends

- use bulk poolset in place of bulk pools for more size options
- allow pipeline/memcpy on smaller transfers
- no explicit limit on courrency; one ult per chunk
- work towards generalizing configuration parameter api
- automatic defaults for buffer settings if pipelining enabled

bake now exposes bake_server_shutdown and
bake_server_wait_for_shutdown (ala margo) to allow servers to
be shutdown more cleanly

A bit cleaner to create and pass around a struct.

- using uuids for now
- uuid is persistently associated with pmempool regardless of mercury
  address or storage location