Change EULA link to point to Licensing page

At least, this link is working.

Issue: altai-113
Change-Id: I28391326b74b94fd76a36a52c6aee191efe89431
Fix install script messages

- refactor confirmation to shell function;
- fixed confirmation prompt using wording from Vasyl Khomenko report.

Issue: altai-126
Change-Id: Icabfbb8f43626f5190f01d2c24cc919bd94cdde2