ipa-adtrust-install failed to start the CIFS services when system's hostname is not FQDN

Issue

When trying to configure a trust with AD, the 1st step is to prepare the environment by executing the ipa-adtrust-install. In the case that the system's hostname does not include the domain part (FQDN) - while the system is properly defined in the DNS server - although the ipa-adtrust-install command will finish successfully, the CIFS services configuration will fail and eventually will not be in RUNNING status