LP2054454 Skip Redis Pass Propogation when Unneeded

LP2054454 Skip Redis Pass Propogation when Unneeded

Avoid error messages from ./configure when no redis accounts file is
present.

--
To test:

autoreconf -i
./configure --prefix=/openils --sysconfdir=/openils/conf
--

If no redis accounts file is present, you should only see this in the
config.log:

configure:14146: result: Skipping Redis accounts password propagation

Release-note: Remove unnecessary error message from ./configure installation step.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>