Bug 11888: Random password suggestion does not work twice

Bug 11888: Random password suggestion does not work twice

This patch adds a simple ajax-call to pull a new suggested password
from the same perl script.

To test:
1) Search for a patron and select "Change password" from the moremember-view.
2) In the member-password-view, click on "Click to fill with a randomly generated suggestion".
3) Confirm that you get a new suggested password and click the same link again.
4) Note that you do not get another suggested password - nothing is happening.
5) Apply patch.
6) Repeat steps 1-3 and confirm that you can keep clicking for a new suggested password.

Patch works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests and QA script. Works as desribed.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>