Bug 1093012 - Set plugins-path for mozmill tests run via mozharness. r=jlund

--HG--
extra : rebase_source : c6fdc7b7d5ebe18563105ac6cfb8325c93e3ffbf
extra : amend_source : b3874dce3daa72cea9b0269d062314b6b1ca0ff0

testing/mozharness/configs/unittests/linux_unittest.py

@@ -147,6 +147,7 @@ config = {
             "options": [
                 "--binary=%(binary_path)s",
                 "--testing-modules-dir=test/modules",
+                "--plugins-path=%(test_plugin_path)s",
                 "--symbols-path=%(symbols_path)s"
             ],
             "run_filename": "runtestlist.py",

testing/mozharness/configs/unittests/mac_unittest.py

@@ -101,6 +101,7 @@ config = {
             "options": [
                 "--binary=%(binary_path)s",
                 "--testing-modules-dir=test/modules",
+                "--plugins-path=%(test_plugin_path)s",
                 "--symbols-path=%(symbols_path)s"
             ],
             "run_filename": "runtestlist.py",

testing/mozharness/configs/unittests/win_unittest.py

@@ -110,6 +110,7 @@ config = {
             "options": [
                 "--binary=%(binary_path)s",
                 "--testing-modules-dir=test/modules",
+                "--plugins-path=%(test_plugin_path)s",
                 "--symbols-path=%(symbols_path)s"
             ],
             "run_filename": "runtestlist.py",