FS-1742 - Make Voicemail use 1 SQL query instead of 4 to get the message count…

FS-1742 - Make Voicemail use 1 SQL query instead of 4 to get the message count use in MWI - Now also working on your more favourite and less favourite databases

src/mod/applications/mod_voicemail/mod_voicemail.c

@@ -1278,7 +1278,9 @@ static void message_count(vm_profile_t *profile, const char *id_in, const char *
 	myid = resolve_id(id_in, domain_name, "message-count");
 
 	switch_snprintf(sql, sizeof(sql),
-					"select read_epoch=0, read_flags, count(read_epoch) from voicemail_msgs where username='%s' and domain='%s' and in_folder='%s' group by read_epoch=0,read_flags;",
+					"select 1, read_flags, count(read_epoch) from voicemail_msgs where username='%s' and domain='%s' and in_folder='%s' and read_epoch=0 group by read_flags 
+					union 
+					select 0, read_flags, count(read_epoch) from voicemail_msgs where username='%s' and domain='%s' and in_folder='%s' and read_epoch<>0 group by read_flags;",	
 					myid, domain_name, myfolder);
 
 	vm_execute_sql_callback(profile, profile->mutex, sql, message_count_callback, &cbt);