Renamed 'idh' integration tests to 'idh2'

Testr runs tests with substring matching. So, it is impossible to
distinguish 'idh' and 'idh3'. Will use 'idh2' and 'idh3'.

Co-Authored-By: Sergey Reshetnyak <sreshetniak@mirantis.com>
Co-Authored-By: Alexander Ignatov <aignatov@miranits.com>

Related to blueprint idh3-itests
Change-Id: I2ac2f22b65196d2e732fb50846a4952d9eb7538d
Merge "Renamed 'idh' integration tests to 'idh2'"