Round 2 of IMAP_STORAGE app_voicemail.c fixes:

This fixes a bug that was thought to be fixed already.

app_voicemail, if using IMAP_STORAGE, has a problem because
the IMAP header files include syslog.h, which define LOG_WARNING
and LOG_DEBUG to be different than what Asterisk uses for those
same macros. This was "fixed" in the past by including all the 
IMAP header files prior to including asterisk.h. This fix worked...
unless you were to try to compile with MALLOC_DEBUG. MALLOC_DEBUG
prepends the inclusion of astmm.h to every file, which means that no
matter what order the includes are in in app_voicemail, the unexpected
values for LOG_WARNING and LOG_DEBUG will be in place.

The action taken for this fix was to define AST_LOG_* macros in addition
to the LOG_* macros already defined. These new macros are used in app_voicemail.c,
logger.h, and astobj.h right now, and their use will be encouraged in the future.

In consideration of those who have written third-party modules which use 
the LOG_* macros, these will NOT be removed from the source, however future use
of these macros is discouraged.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@114577 65c4cc65-6c06-0410-ace0-fbb531ad65f3