Merge branch '270-parametrage-de-la-gtest' into 'master'

Resolve "Paramétrage de la ĞTest" (!327)

Closes #270

* fix clippy warnings

* fix a warning (InherentData imported only if std)

* UdCreationPeriod & UdReevalPeriod should be type Moment

* Update gtests parameters according to Hugo suggestion

https://forum.duniter.org/t/gtest-parametres/13134/8?u=elois

* gtest: IdtyCreationPeriod: 10 days -> 1 day

* gtest: ConfirmPeriod and IdtyCreationPeriod: 1 day -> 10 days

* gtest: allow smith inactivity for 3 months

* gtest: apply same session duration as g1 (4 hours)

* gtest: use g1 SS58Prefix