HYD-2221 Installer hardening
HYD-2221 Installer hardening

* move EULA display to its own function
* rearrange log setup
* makedirs shouldn't fail on EEXIST

Change-Id: I565be95e6d1e82e4aab91a2fa49b8b7b4a6fd534

intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre