astobj2: Add tag variants for ao2_bump, ao2_cleanup, and ao2_replace

Tags are useful in hunting down ref imbalances; this patch adds tag variants
for these commonly used macros/functions.

Review: https://reviewboard.asterisk.org/r/3750/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@418419 65c4cc65-6c06-0410-ace0-fbb531ad65f3