Get path for answer file from environment

Change-Id: I647a52e4af0079b7047625ba01a35079c356474a
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1159028
Signed-off-by: Artyom Lukianov <alukiano@redhat.com>
(cherry picked from commit f505ea46cfb13db98ad165cd86d00d38dd4d25b5)