Hob: change the code style to enumerate a list in a for-loop

Hob: change the code style to enumerate a list in a for-loop

We use the more common style to enumerate a list in a for-loop
(http://docs.python.org/library/functions.html#enumerate), that is:

try to use
for item in mylist,

and try to use
for i, item in enumerate(list)
rather than
for i in range(len(mylist))

(From Poky rev: 33c21bc60bd1542f81d33c328f116dec424728cd)

(Bitbake rev: 9b168239a5d9693573438eb6514938b81de85af3)

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>