fixing smbtorture base.createx_sharemodes_file test

[Herb Lewis]

This test and base.createx_sharemodes_dir do not really test handling of 
sharemode
conflicts because we close the first file handle before we attempt to 
open the file again.
The problem with the fix is that it now makes the 
base.createx_sharemodes_file test
take a long time because of the 1 second delay before we return 
SHARING_VIOLATION
on those cases that now conflict. We probably need to set the smb.conf 
parameter
"defer sharing violations = no" when this test is run and then make sure 
it is back to
normal for the base.defer_open test.

Is there is a way to do this in the automatic testing?