PEP-0274 introduced dict comprehensions to replace dict constructor
with a sequence of length-2 sequences, these are benefits copied
from [1]:
The dictionary constructor approach has two distinct disadvantages
from the proposed syntax though. First, it isn't as legible as a
dict comprehension. Second, it forces the programmer to create an
in-core list object first, which could be expensive.
Magnum does not support python 2.6, we can leverage this.
There is deep dive about PEP-0274[2] and basic tests about
performance[3].
Note: This commit doesn't handle dict constructor with kwagrs.
This commit also adds a hacking rule.
[1]http://legacy.python.org/dev/peps/pep-0274/
[2]http://doughellmann.com/2012/11/12/the-performance-impact-of-using
-dict-instead-of-in-cpython-2-7-2.html
[3]http://paste.openstack.org/show/480757/
Change-Id: I61992fa428d6760449afe3754b02506336e8b421
98875345c2