This bug is seen when doing a 'pkg image-update' on build 90. pkg produces the
error:

# pkg image-update
pkg: attempt to mount opensolaris-1 failed.
pkg: image-update cannot be done on live image 

The cause is that libbe_pymod/libbe.c:beCopy() is freeing nvlist variables
before returning them to the caller. Here's the snippet:

               if (nvlist_lookup_string(beAttrs, BE_ATTR_NEW_BE_NAME,
                   &trgtBeName) != 0) {
                       goto cleanupFailure;
               }
               if (nvlist_lookup_string(beAttrs, BE_ATTR_SNAP_NAME,
                   &trgtSnapName) != 0) {
                       goto cleanupFailure;
               }

               nvlist_free(beAttrs);

               return (Py_BuildValue("[iss]", 0, trgtBeName, trgtSnapName)); 

Calling nvlist_free(beAttrs) before building python values and returning them
results in deallocated references for trgtBeName and trgtSnapName resulting in
junk being returned to the caller.

Thanks to Ethan for root causing this one.