file example: set WCE
file example: set WCE

file example may be writing to the page cache, so set WCE to make
sure we get SYNCHRONICE CACHE commands.

Signed-off-by: Mike Christie <39daeb1549a929782e38aa87c4e3da7f3844b09a@redhat.com>

agrover/tcmu-runner,open-iscsi/tcmu-runner,open-iscsi/tcmu-runner