[master] Do not abort the installation when an addon EULA is refused

[dgdavid]

🚨 Update: a wrong change introduced here has been fixed in #90. See the comment below

📝 Similar to #78, but for master (aka SLE-15-SP2)

Problem

When user refuses an addon's EULA (doing click in "Next" without check the I Agree to the License Terms.) the installation is completely aborted.

• https://bugzilla.suse.com/show_bug.cgi?id=1114018
• https://trello.com/c/Kc9mRVpB

Solution

just go ahead refusing the license and not installing/registering the addon, according to the message shown to the user.

Show/hide screenshot

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The message shown to the user, from an SLE-12 Screenshot (still being the same)

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To do that, it has been necessary to update yast2-packager too (see yast/yast-packager#456), in order to support "refuse" as a cancel action. Otherwise, it is not possible to distinguish when the "abort" means "to refuse the license agreement" or "abort the installation".

Tests

• Only tested manually via driver update.

[coveralls]

Coverage decreased (-0.02%) to 18.743% when pulling 05100cd on feature/bsc-1114018-sle15sp2 into 9f98a69 on master.

[yast-bot]

✔️ Public Jenkins job #19 successfully finished
✔️ Created OBS submit request #713016

[yast-bot]

✔️ Internal Jenkins job #3 successfully finished
✔️ Created IBS submit request #195839

[dgdavid]

This break here avoid the right propagation of the user input from the sub-workflow (aka ret2) to the main workflow (aka ret).

Fixed in #90

[dgdavid]

As commented, the break introduced here breaks the installer workflow when user is going :back. Fixed in #90.