Changed recipe_modules base paths to be abstract entities in their own right.

scripts/slave/recipes/blink_trybot.expected/non_cq_tryjob.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\bot_update.py",
       "--master",
       "tryserver.blink",
       "--builder",
       "win_blink_rel",
@@ skipping 80 matching lines @@
     ],
     "env": {
       "GYP_DEFINES": "archive_gpu_tests=1 chromium_win_pch=0 component=static_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]\\goma' target_arch=ia32 test_isolation_mode=prepare use_goma=1"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\isolate\\resources\\find_isolated_tests.py",
+      "RECIPE_MODULE[isolate]\\resources\\find_isolated_tests.py",
       "--build-dir",
       "[SLAVE_BUILD]\\src\\out\\Release",
       "--clean-isolated-files"
     ],
     "name": "clean isolated files"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 1470 matching lines @@
     "~followup_annotations": [
       "@@@STEP_LINK@layout_test_results@https://storage.googleapis.com/chromium-layout-test-archives/win_blink_rel/571/layout-test-results/results.html@@@",
       "@@@STEP_LINK@(zip)@https://storage.googleapis.com/chromium-layout-test-archives/win_blink_rel/571/layout-test-results.zip@@@"
     ]
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\swarming\\resources\\collect_gtest_task.py",
+      "RECIPE_MODULE[swarming]\\resources\\collect_gtest_task.py",
       "--swarming-client-dir",
       "[SLAVE_BUILD]\\src\\tools\\swarming_client",
       "--temp-root-dir",
       "[TMP_BASE]",
       "--merged-test-output",
       "/path/to/tmp/json",
       "--",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--shards",
       "1",
       "content_gl_tests on NVIDIA GPU on Windows (with patch)/Windows/[dummy has/win_blink_rel/571"
     ],
     "name": "content_gl_tests on NVIDIA GPU on Windows (with patch) on Windows"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\swarming\\resources\\collect_gtest_task.py",
+      "RECIPE_MODULE[swarming]\\resources\\collect_gtest_task.py",
       "--swarming-client-dir",
       "[SLAVE_BUILD]\\src\\tools\\swarming_client",
       "--temp-root-dir",
       "[TMP_BASE]",
       "--merged-test-output",
       "/path/to/tmp/json",
       "--",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--shards",
       "1",
       "gl_tests on NVIDIA GPU on Windows (with patch)/Windows/[dummy has/win_blink_rel/571"
     ],
     "name": "gl_tests on NVIDIA GPU on Windows (with patch) on Windows"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\swarming\\resources\\collect_gtest_task.py",
+      "RECIPE_MODULE[swarming]\\resources\\collect_gtest_task.py",
       "--swarming-client-dir",
       "[SLAVE_BUILD]\\src\\tools\\swarming_client",
       "--temp-root-dir",
       "[TMP_BASE]",
       "--merged-test-output",
       "/path/to/tmp/json",
       "--",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
@@ skipping 183 matching lines @@
       "--task-output-dir",
       "/path/to/tmp/"
     ],
     "name": "gpu_rasterization on NVIDIA GPU on Windows (with patch) on Windows"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\swarming\\resources\\collect_gtest_task.py",
+      "RECIPE_MODULE[swarming]\\resources\\collect_gtest_task.py",
       "--swarming-client-dir",
       "[SLAVE_BUILD]\\src\\tools\\swarming_client",
       "--temp-root-dir",
       "[TMP_BASE]",
       "--merged-test-output",
       "/path/to/tmp/json",
       "--",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--shards",
       "1",
       "tab_capture_end2end_tests on NVIDIA GPU on Windows (with patch)/Windows/[dummy has/win_blink_rel/571"
     ],
     "name": "tab_capture_end2end_tests on NVIDIA GPU on Windows (with patch) on Windows"
   }
 ]