Bug 23075: (follow-up) Dissallow transparent redirects

Bug 23075: (follow-up) Dissallow transparent redirects

GET request redirects were causing the http URL to 'pass' our 'good url'
test for http => https redirected mana servers. However, on the
subsquent POST request to get a mana security token we would fail as the
POST was not transparently redirected.

This patch changes the request to be a simple_request so we will catch
bad urls earlier and it also prevents submissions for security tokens if
the configured URL is identified as bad.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>