Importing munch inside of SDK is taking around 0.3 second. Itself it is
not a big problem, but it hurts on the openstackclient front. In
addition to that munch project does not seem to be actively maintained
and had no releases since 2 years.
Dropping this dependency at once is requiring quite a big rework so
instead copy a heavily stripped version of what we really require from
it. This helps us to gain performance improvement while giving time to
rework our code to come up with a decicion on how to deal with it.
Change-Id: I6612278ae798d48b296239e3359026584efb8a70
6e5f34dba5