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Since we don't use Crypo module directly.

This fixes the following warnings:

  DeprecationWarning: [3.25] __secure__ argument is deprecated
  DeprecationWarning: [3.25] secure argument is deprecated

Accordingly, we now require cubicweb >= 3.25.

Notice that we drop a test case which sole purpose was to check that
things work with https-url option. Since this option does not exist
anymore, the test is now meaningless. On the other hand, we extend the
remaing tests for notification view (test_reset_password) to now check
for the presence of instance URL in sent email.