This patch addresses the problem if a user has the following in one of their 
automount maps:
# auto.misc
test 	-fstype=autofs    auto.m2

Before it would automatically assume that auto.m2 was a yp/nis map.  The patch 
now checks if the file exists in /etc/ (and if it's a file or program map) or 
if it exists in yp (according to the order in nsswitch.conf).

In the future we may want to include functionality in the lookup_xxx.so 
modules so we can more easily detect if a certain map exists.

Thanks,
Chris