Break tools out into their own dirs

tools/yamllint/BUILD

@@ -0,0 +1,8 @@
+# WARNING: YAMLLINT is GLP3'd code. Do not extend, modify or depend on this as a lib.
+py_binary(
+    name = "yamllint",
+    main = "__main__.py",
+    deps = [
+        py_requirement("yamllint"),
+    ]
+)

tools/yamllint/__main__.py

@@ -0,0 +1,15 @@
+#!/usr/bin/python
+
+# WARNING: Yamllint is GPL3'd code.
+
+"""A shim for executing yamllint."""
+
+import re
+import sys
+
+from yamllint.cli import run
+
+
+if __name__ == "__main__":
+    sys.argv[0] = re.sub(r"(-script\.pyw?|\.exe)?$", "", sys.argv[0])
+    sys.exit(run())