new lightweight open_query/close_query IB extension for fast attribute query

new lightweight open_query/close_query IB extension for fast attribute query

Consumers that need provider attributes must do a full device open
in order to get any provider/device information. With so many static device
entries in /etc/dat.conf consumers are building classification
mechanisms to identify provider type, locality, name, device
mode, and decide which device is appropriate. The existing DAT interface
doesn't provide a lightweight mechanism for queries.

The following fast query functions have been added to dat_ib_extensions.h:

dat_ib_open_query(name, ia_handle, ia_mask, ia_attr, prov_mask, prov_attr)
dat_ib_close_query(ia_handle)

In addition, DAT extension interface, dat_extension_op, has been
expanded to include new internal calls to handle quick provider load
and function linkage via udat_extension_open, and udat_extension_close
functions. Extended operations needing DAT open/close services need
to be defined from a DAT_OPEN_EXTENSION_BASE or DAT_CLOSE_EXTENSION_BASE
respectively.

NOTE: The ia_handle returned with open query must be closed with subsequent
close_query and not used with any other dat_ia_ operations. Attribute
storage from query_open is not valid after close_query call.

The IB extensions have been rolled to version 2.0.8 with this new API.
The changes are backward compatible.

Signed-off-by: Arlin Davis <arlin.r.davis@intel.com>