More coding style cleanup

Fixing more issues found with pylint.  Some that were supposed to
have been fixed in the previous sweep (Ie0db839e) but were missed:

C0321: More than one statement on a single line
W0622: Redefining built-in 'name'

And some more:

W0631: Using possibly undefined loop variable 'name'
W0223: Method 'name' is abstract in class 'name' but is not overridden
W0231: __init__ method from base class 'name' is not called

Change-Id: Ie119183708609d6279e973057a385fde864230c3

subcmds/forall.py

@@ -141,12 +141,16 @@ terminal and are not redirected.
       for cn in cmd[1:]:
         if not cn.startswith('-'):
           break
-      if cn in _CAN_COLOR:
+      else:
+        cn = None
+      # pylint: disable-msg=W0631
+      if cn and cn in _CAN_COLOR:
         class ColorCmd(Coloring):
           def __init__(self, config, cmd):
             Coloring.__init__(self, config, cmd)
         if ColorCmd(self.manifest.manifestProject.config, cn).is_on:
           cmd.insert(cmd.index(cn) + 1, '--color')
+      # pylint: enable-msg=W0631
 
     mirror = self.manifest.IsMirror
     out = ForallColoring(self.manifest.manifestProject.config)