[recipes.py] add missing helpstrings, merge test subcommands into main parser.

recipe_engine/lint_test.py

Index: recipe_engine/lint_test.py
diff --git a/recipe_engine/lint_test.py b/recipe_engine/lint_test.py
index f71348e32b0b087a0698e53271b8be0df77b01dd..0df128066cb1ec91e1a272e3d34281f444d512fe 100755
--- a/recipe_engine/lint_test.py
+++ b/recipe_engine/lint_test.py
@@ -62,9 +62,11 @@ def ImportsTest(recipe_path, recipe_name, whitelist, universe_view):
 
 
 def add_subparser(parser):
+  # TODO(iannucci): merge this with the test command, doesn't need to be top
+  # level.
+  helpstr = 'Check recipes for stylistic and hygenic issues.'
   lint_p = parser.add_parser(
-      'lint',
-      description='Check recipes for stylistic and hygenic issues')
+      'lint', help=helpstr, description=helpstr)
   lint_p.add_argument(
       '--whitelist', '-w', action='append', default=[],
       help='A regexp matching module names to add to the default whitelist. '