fixing paths for test run on CI (rebased onto develop)


This is the same as gh-3191 but rebased onto develop.

----

OMERO.web integration tests are running using library under ```components/tools/OmeroPy/target/lib/python``` rather then dist. Unfortunately if ```OMERO_HOME``` is not set all omero properties are missed. With the multiple-servers deployment integration tests are failing because they run against ```localhost:4064```. This fix should resolve CI failure.

cc: @sbesson, @ximenesuk, @will-moore 

Please note: we are already doing this patching all across the place, https://github.com/openmicroscopy/openmicroscopy/blob/develop/components/tools/OmeroPy/test/integration/library.py#L201

Test results:
```
test/integration/test_csrf.py:161: TestCsrf.test_csrf_middleware_enabled PASSED
test/integration/test_csrf.py:180: TestCsrf.test_forgot_password PASSED
test/integration/test_csrf.py:190: TestCsrf.test_add_and_rename_container PASSED
test/integration/test_csrf.py:231: TestCsrf.test_move_data PASSED
test/integration/test_csrf.py:248: TestCsrf.test_add_and_remove_comment PASSED
test/integration/test_csrf.py:263: TestCsrf.test_add_edit_and_remove_tag PASSED
test/integration/test_csrf.py:306: TestCsrf.test_attach_file PASSED
test/integration/test_csrf.py:347: TestCsrf.test_paste_move_remove_deletamany_image PASSED
test/integration/test_csrf.py:401: TestCsrf.test_basket_actions PASSED
test/integration/test_csrf.py:464: TestCsrf.test_edit_channel_names PASSED
test/integration/test_csrf.py:481: TestCsrf.test_copy_past_rendering_settings PASSED
test/integration/test_csrf.py:505: TestCsrf.test_reset_rendering_settings PASSED
test/integration/test_csrf.py:527: TestCsrf.test_apply_owners_rendering_settings PASSED
test/integration/test_csrf.py:541: TestCsrf.test_ome_tiff_script PASSED
test/integration/test_csrf.py:557: TestCsrf.test_script PASSED
test/integration/test_csrf.py:581: TestCsrf.test_myaccount PASSED
test/integration/test_csrf.py:598: TestCsrf.test_avatar PASSED
test/integration/test_csrf.py:660: TestCsrf.test_create_group PASSED
test/integration/test_csrf.py:672: TestCsrf.test_create_user PASSED
test/integration/test_csrf.py:690: TestCsrf.test_edit_group PASSED
test/integration/test_csrf.py:702: TestCsrf.test_edit_user PASSED
test/integration/test_csrf.py:717: TestCsrf.test_edit_group_by_owner PASSED
test/integration/test_csrf.py:737: TestCsrf.test_change_password PASSED
test/integration/test_csrf.py:749: TestCsrf.test_su PASSED
```