Eliminate Wiremock output from a build log

[php-coder]

Wiremock outputs the following messages to a build log:

                                                Request was not matched
                                               =======================

-----------------------------------------------------------------------------------------------------------------------
| Closest stub                                             | Request                                                  |
-----------------------------------------------------------------------------------------------------------------------
                                                           |
GET                                                        | GET
/series/not-image-file                                     | /series/import/request-logic/catalog-numbers-in-descripti<<<<< URL does not match
                                                           | on.html
                                                           |
                                                           |
-----------------------------------------------------------------------------------------------------------------------

.2020-01-26 15:45:32.634
                                               Request was not matched
                                               =======================

-----------------------------------------------------------------------------------------------------------------------
| Closest stub                                             | Request                                                  |
-----------------------------------------------------------------------------------------------------------------------
                                                           |
GET                                                        | GET
/series/empty-jpeg-file                                    | /series/import/request-logic/existing-seller.html   <<<<< URL does not match
                                                           |
                                                           |
-----------------------------------------------------------------------------------------------------------------------

.2020-01-26 15:45:33.302
                                               Request was not matched
                                               =======================

-----------------------------------------------------------------------------------------------------------------------
| Closest stub                                             | Request                                                  |
-----------------------------------------------------------------------------------------------------------------------
                                                           |
GET                                                        | GET
/series/not-image-file                                     | /series/import/request-logic/new-seller.html        <<<<< URL does not match
                                                           |
                                                           |
-----------------------------------------------------------------------------------------------------------------------

..2020-01-26 15:45:34.061
                                               Request was not matched
                                               =======================

-----------------------------------------------------------------------------------------------------------------------
| Closest stub                                             | Request                                                  |
-----------------------------------------------------------------------------------------------------------------------
                                                           |
GET                                                        | GET
/series/empty-jpeg-file                                    | /series/import/request-logic/simple.html            <<<<< URL does not match
                                                           |
                                                           |
-----------------------------------------------------------------------------------------------------------------------

Example build log: https://travis-ci.org/php-coder/mystamps/jobs/642046563

After debugging it has turned out that these are false positives: these requests serve static resources but Wiremock first tries to find mocks for them and as none exists it logs such messages. I've created an issue to the upstream: wiremock/wiremock#1247

As a workaround we can:

• turn off the messages from corresponding logger
• use mocks instead of stubs