Currently the devel packages are installed everywhere,
but they only need to be where the wheels are built.
Also, there is already a task to install the packages
needed on the target hosts when installing - so we do
not need to give the same list to the venv install role
because they will already have been installed.
We remove the unnecessary installation of the compiling
packages because the python venv build role already does
it. We also remove the curl and which packages as they
appear to be unused. The git package is moved to the
devel package list as it's only used there.
We also re-order the package lists alphabetically to
make them easier to follow.
Depends-On: https://review.openstack.org/613585
Change-Id: I6d037c45aee8b54502a2e3f3add56b23be34109d
430932f274