Regroup the ao2 search_flags.

Moved the OBJ_POINTER, OBJ_KEY, and OBJ_PARTIAL_KEY flags together into a
field and renamed them to OBJ_SEARCH_OBJECT, OBJ_SEARCH_KEY, and
OBJ_SEARCH_PARTIAL_KEY respectively.  The values were selected to keep
existing code compiling and working until the codebase can be changed to
stop using these values as bit flags and use them as an enum field.

The old names are defined to the new names for backward compatibility.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@394846 65c4cc65-6c06-0410-ace0-fbb531ad65f3