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

scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___debug___3.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\kill_processes.py"
     ],
     "name": "taskkill"
   },
   {
@@ skipping 91 matching lines @@
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"V8 Win32 - debug - 3\", \"buildnumber\": 571, \"mastername\": \"client.v8\", \"parent_buildername\": \"V8 Win32 - debug builder\", \"parent_got_revision\": \"54321\", \"recipe\": \"v8\", \"revision\": \"20123\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"V8 Win32 - debug - 3\", \"buildnumber\": 571, \"mastername\": \"client.v8\", \"parent_buildername\": \"V8 Win32 - debug builder\", \"parent_got_revision\": \"54321\", \"recipe\": \"v8\", \"revision\": \"20123\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
     "name": "extract build"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\v8\\resources\\v8testing.py",
+      "RECIPE_MODULE[v8]\\resources\\v8testing.py",
       "--target",
       "Debug",
       "--arch",
       "ia32",
       "--testname",
       "unittests",
       "--no-variants",
       "--shard_count=3",
       "--shard_run=3",
       "--json-test-results",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]\\v8",
     "name": "Unittests"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\v8\\resources\\v8testing.py",
+      "RECIPE_MODULE[v8]\\resources\\v8testing.py",
       "--target",
       "Debug",
       "--arch",
       "ia32",
       "--testname",
       "default",
       "--shard_count=3",
       "--shard_run=3",
       "--flaky-tests",
       "skip",
       "--json-test-results",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]\\v8",
     "name": "Check"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\v8\\resources\\v8testing.py",
+      "RECIPE_MODULE[v8]\\resources\\v8testing.py",
       "--target",
       "Debug",
       "--arch",
       "ia32",
       "--testname",
       "default",
       "--shard_count=3",
       "--shard_run=3",
       "--flaky-tests",
       "run",
       "--json-test-results",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]\\v8",
     "name": "Check - flaky"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\v8\\resources\\v8testing.py",
+      "RECIPE_MODULE[v8]\\resources\\v8testing.py",
       "--target",
       "Debug",
       "--arch",
       "ia32",
       "--testname",
       "webkit",
       "--shard_count=3",
       "--shard_run=3",
       "--flaky-tests",
       "skip",
       "--json-test-results",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]\\v8",
     "name": "Webkit"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\v8\\resources\\v8testing.py",
+      "RECIPE_MODULE[v8]\\resources\\v8testing.py",
       "--target",
       "Debug",
       "--arch",
       "ia32",
       "--testname",
       "webkit",
       "--shard_count=3",
       "--shard_run=3",
       "--flaky-tests",
       "run",
       "--json-test-results",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]\\v8",
     "name": "Webkit - flaky"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\v8\\resources\\v8testing.py",
+      "RECIPE_MODULE[v8]\\resources\\v8testing.py",
       "--target",
       "Debug",
       "--arch",
       "ia32",
       "--testname",
       "test262",
       "--no-variants",
       "--shard_count=3",
       "--shard_run=3",
       "--json-test-results",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]\\v8",
     "name": "Test262 - no variants"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\v8\\resources\\v8testing.py",
+      "RECIPE_MODULE[v8]\\resources\\v8testing.py",
       "--target",
       "Debug",
       "--arch",
       "ia32",
       "--testname",
       "mozilla",
       "--shard_count=3",
       "--shard_run=3",
       "--json-test-results",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]\\v8",
     "name": "Mozilla"
   }
 ]