Make linkchecker service compatible with Guzzle7 [#3396666]

Problem/Motivation

When using the linkchecker service to check a link with a connectivity problem the request will error out:

TypeError: Drupal\linkchecker\LinkCheckerService::Drupal\linkchecker\{closure}(): Argument #1 ($e) must be of type GuzzleHttp\Exception\RequestException, GuzzleHttp\Exception\ConnectException given

This is a known issue due to changes in Guzzle7, well explained in #3188920: Make Guzzle exception handling forward-compatible with Guzzle 7.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Comment	File	Size	Author
#2	linkchecker-guzzle7-compatibility-3396666-2.patch	1.42 KB	joel_osc

Issue fork linkchecker-3396666

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3396666-make-linkchecker-service changes, plain diff MR !132
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