Fix execution of deploy hooks inside a module with _deploy in the name.

[pfrenssen]

Fixes #5216

[pfrenssen]

Interesting that this is working on Appveyor. On linux the test fails correctly:

$ composer functional -- --filter testDeployHooksInModuleWithDeployInName
[...]
1) Unish\DeployHookTest::testDeployHooksInModuleWithDeployInName
Exception: Unexpected exit code 1 (expected 0) for command:
/home/pieter/drush/vendor/drush/drush/drush --uri=dev --no-interaction deploy:hook --yes/home/pieter/drush/vendor/drush/drush/drush --uri=dev --no-interaction deploy:hook --yes

Exit Code: 1(General error)

Working directory: /home/pieter/drush/vendor/drush/drush

Output:
================
 -------- ----------------- -------------------------------------------
  Module   Hook              Description
 -------- ----------------- -------------------------------------------
  woot     deploy_function   Deploy hook in module containing _deploy.
 -------- ----------------- -------------------------------------------


 // Do you wish to run the specified pending deploy hooks?: yes.



Error Output:
================
>  [warning] Deploy hook function woot_deploy_deploy_function not found in file woot.deploy.php
>  [error]  Deploy hook failed: woot_deploy_deploy_function
 [error]  Update aborted by: woot_deploy_deploy_function
 [error]  Finished performing deploy hooks.


/home/pieter/drush/vendor/drush/drush/src/TestTraits/CliTestTrait.php:158
/home/pieter/drush/vendor/drush/drush/tests/unish/CommandUnishTestCase.php:102
/home/pieter/drush/vendor/drush/drush/tests/functional/DeployHookTest.php:108
phpvfscomposer:///home/pieter/drush/vendor/drush/drush/vendor/phpunit/phpunit/phpunit:97

[trent-crawford]

@pfrenssen has requested that I review this fix as we are working on the same project. I have reviewed code and it looks good and I confirm that this pull request has fixed our project pipeline.

[weitzman]

LGTM. @bircher - look ok to you?