Wrong installation date in product info report

Description of problem:
Product info report shows wrong installation date in wildfly. Reported installation date is date of wildfly building.

How reproducible:
Always on EAP from zip installation

Steps to Reproduce:

1. get fresh wildfly from git
2. build wildfly
3. ./standalone.sh
4. ./jboss-cli.sh -c
5. :product-info

Actual results:
installation-date is a date of wildfly building

Expected results:
If Product Install Date is not available, wildfly do not report it.

Additional info:
Installation date is reported correctly, when installer is used.