Accept the IBM DB2 license during the DIB process

[Gaëtan Trellu]

During the DB2 installation, the db2_install process asks a question about the license.
Disk Image Builder will hang until yes or no is entered.

db2_install provides the "-y" option to accept automatically the license.

---
-y
Specifies that you have read and agreed to the license agreement file in the db2/license directory
on the CD. This parameter is mandatory when -n is specified.
---

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/540434

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/540434
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=c334c5e46d5a66e6ff00641c803465b60daafd76
Submitter: Zuul
Branch: master

commit c334c5e46d5a66e6ff00641c803465b60daafd76
Author: Gaetan Trellu <email address hidden>
Date: Fri Feb 2 11:12:02 2018 -0500

    Accept the IBM DB2 license during the DIB process

    During the DB2 installation, the db2_install
    process asks a question about the license. Disk
    Image Builder will hang until "yes" or "no" is
    manually entered.

    db2_install script provides the "-y" option to
    accept automatically the license.

    From db2_install help:
      Specifies that you have read and agreed to the
      license agreement file in the db2/license
      directory on the CD. This parameter is mandatory
      when -n is specified.

    Change-Id: I8a8330adc41cbed60c8472f925b10cf816aed44e
    Closes-Bug: #1747031

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/trove 9.0.0.0rc1 release candidate.