Remove opal_recursion_depth_counter and opal_progress_thread_count. These counters add two
atomics in the critical path and are not currently used. We can bring them back if there
turns out to be a good use for them.

cmr=v1.7.4:reviewer=brbarret
Fix a couple issues with the mca_base_var system:

 - Use ->boolval for booleans when creating a string.
 - Solaris has some issue with the ?: used in one of find functions. Use an if instead.
 - Change all instances of index -> vari to avoid issues with redefining index.

cmr=v1.7.4:reviewer=jsquyres
Add missing include file.

Thanks to Paul Hargrove for spotting it.

cmr=v1.7.4:reviewer=jsquyres