Add option to add IP address to existing list

[barryvdh]

Description

When adding a new IP-address, you have to copy the existing ones. This adds a --add flag to just append the addresses, instead of replacing

Manual testing scenarios

1. Set the IP address
2. Add new ones with --add
3. See the existing one still on the list

[barryvdh]

I've added a basic test for this.

[magento-cicd2]

All committers have signed the CLA.

[ihor-sviziev]

@barryvdh in general your changes looks good, but static tests failing due to Cyclomatic Complexity of 10 in tests. Could you adjust your test to have less complexity or at least suppress the warning?

[barryvdh]

@ihor-sviziev I tried to follow the existing test, but should I just create my own seperate test for this, instead of using the provider?

[barryvdh]

@ihor-sviziev I've updated the tests. All checks are passing now.

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
MAGETWO-87975 has been created to process this Pull Request

[TomashKhamlai]

Can you please remove the comma sign between IP-addresses on the line? #L152. I believe that this will help.

The test fails with:

Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'Set exempt IP-addresses: 127.0.0.1, 127.0.0.2\n
+'Set exempt IP-addresses: 127.0.0.1 127.0.0.2\n

Please, fix the test and push again.

[barryvdh]

Thanks, that was changed since I made this PR. I've updated it now.

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
MAGETWO-87975 has been created to process this Pull Request